Compound holographic optical element with two superposition hologram patterns for converging and diffracting a light beam

Claim 2

An optical pick-up apparatus comprising: a light emitting element for emitting a light supplied to an optical disk; a photo detector for receiving the light reflected at said optical disk; and a compound holographic optical element whose hologram pattern is a superposition of a first hologram pattern for converging the light emitted from the light emitting element onto the optical disk and a second hologram pattern for diffracting the light having been reflected at the optical disk toward said photo detector.

Claim 3

An optical pick-up apparatus comprising: a light emitting element for emitting a light supplied to an optical desk; a photo detector for receiving the light reflected at said optical disk; and a compound holographic optical element whose hologram pattern is a superposition of a first hologram pattern for converging the light emitted from the light emitting element onto the optical disk and a second hologram pattern for diffracting the light having been reflected at the optical disk toward said photo detector and changing it into a focusing light.

Claim 4

An optical pick-up apparatus comprising: a light emitting element for emitting a light supplied to an optical desk; a photo detector for receiving the light reflected at said optical disk; and a compound holographic optical element whose hologram pattern is a superposition of a first hologram pattern for converging the light emitted from the light emitting element onto the optical disk and a second hologram pattern for diffracting the light having been reflected at the optical disk toward said photo detector and changing it into a focusing light.

Claim 5

An optical pick-up apparatus comprising: a light emitting element for emitting a light supplied to an optical disk; a photo detector for receiving the light reflected at said optical disk; a transparent light guide having two surfaces, a first surface of which confronts with said optical disk and a second surface of which confronts with said light emitting element and said photo detector, for guiding the light emitted from said light emitting element onto said optical disk by use of a plurality of reflections caused inside thereof and also guiding the light reflected at the optical disk toward said photo detector; and a compound holographic optical element, provided on said first surface, whose hologram pattern is a superposition of a first hologram pattern for converging the light emitted from the light emitting element onto the optical disk and a second hologram pattern for diffracting the light having been reflected at the optical disk toward said photo detector and changing it into a focusing light.

Claim 6

An optical pick-up apparatus comprising: a light emitting element for emitting a light supplied to an optical disk; a photo detector for receiving the light reflected at said optical disk; a transparent light guide having two surfaces, a first surface of which confronts with said optical disk and a second surface of which confronts with said light emitting element and said photo detector, for guiding the light emitted from said light emitting element onto said optical disk by use of a plurality of reflections caused inside thereof and also guiding the light reflected at the optical disk toward said photo detector; and a compound holographic optical element, provided on said first surface, whose hologram pattern is a superposition of a first hologram pattern for converging the light emitted from the light emitting element onto the optical disk and a second hologram pattern for diffracting the light having been reflected at the optical disk toward said photo detector and changing it into a focusing light.

Claim 7

An optical pick-up apparatus in accordance with claim 3, further comprising a phase difference control film, provided on said light guide, for controlling a phase difference between polarized components of the light emitted from said light emitting element.

Claim 8

An optical pick-up apparatus in accordance with claim 3, wherein all the second surface of the light guide except for light reflection and light transmitting regions is coated by a light shielding film.

Claim 9

An optical pick-up apparatus in accordance with claim 3, wherein light quantity distributions of the light emitted from said light emitting element is elliptic formation on a plane normal to an optical axis of this light, and a minor axis of said elliptic formation is aligned on a plane including an optical axis of the light in an optical path starting from said light emitting element and arriving at said compound hologram.

Claim 10

An optical pick-up apparatus in accordance with claim 3, wherein said light emitting element and photo detector are spaced from said light guide.

Claim 11

An optical pick-up apparatus in accordance with claim 3, wherein said light emitting element and photo detector are spaced from said light guide, and there is provided an incident light reflection member for reflecting the light emitted from said light emitting element toward said light guide so as to lead it into the light guide.

Claim 12

An optical pick-up apparatus in accordance with claim 3, further comprising an incident light reflection member for reflecting the light emitted from said light emitting element toward said light guide so as to lead it into the light guide, and said light emitting element and said incident light reflection member are disposed on a sensor substrate on which said photo detector is provided.

Claim 13

An optical pick-up apparatus in accordance with claim 3, further comprising a trapezoidal prism having an inclined reflection surface, on which semi-transmission film is coated, for reflecting the light emitted from said light emitting element toward said light guide so as to lead it into the light guide, said light emitting element and said trapezoidal prism being disposed on a sensor substrate on which said photo detector is provided, and a light quantity monitor sensor being formed on said sensor substrate at a region which a bottom of said prism contacts with, thereby transmitting a part of the light emitted from said light emitting element into said trapezoidal prism to detect light quantity by said light quantity monitor sensor.

Claim 14

An optical pick-up apparatus comprising: a light emitting element for emitting a light supplied to an optical disk; first and second photo detectors for receiving the light reflected at said optical disk; a transparent light guide having two surfaces, a first surface of which confronts with said optical disk and a second surface of which confronts with said light emitting element and said two photo detectors, for guiding the light emitted from said light emitting element onto said optical disk by use of a plurality of reflections caused inside thereof and also guiding the light reflected at the optical disk toward said two photo detectors; a compound holographic optical element, provided on said first surface, whose hologram pattern is a superposition of a first hologram pattern for converging the light emitted from the light emitting element onto the optical disk and a second hologram pattern for diffracting the light reflected at the optical disk toward said two photo detectors and changing it into a focusing light; a semi-transmission portion, provided on said second surface, for transmitting a part of the light having been reflected at the optical disk and passed through said holographic optical element and for reflecting the remainder of the light; a reflection portion, provided on said first surface, for receiving said remainder of said light reflected by said semi-transmission portion and reflecting it toward said second photo detector; a focal point of said light having been reflected at the optical disk and passed through said holographic optical element residing on an optical path between said semi-transmission portion and said second photo sensor; and said first and second photo detectors detecting focusing error and tracking error as well as information recorded on the optical disk.

Claim 15

An optical pick-up apparatus comprising: a light emitting element for emitting a light supplied to an optical disk; first and second photo detectors for receiving the light reflected at said optical disk; a transparent light guide having two surfaces, a first surface of which confronts with said optical disk and a second surface of which confronts with said light emitting element and said two photo detectors, for guiding the light emitted from said light emitting element onto said optical disk by use of a plurality of reflections caused inside thereof and also guiding the light reflected at the optical disk toward said two photo detectors; a compound holographic optical element, provided on said first surface, whose hologram pattern is a superposition of a first hologram pattern for converging the light emitted from the light emitting element onto the optical disk and a second hologram pattern for diffracting the light reflected at the optical disk toward said two photo detectors and changing it into a focusing light; a semi-transmission portion, provided on said second surface, for transmitting a part of the light having been reflected at the optical disk and passed through said holographic optical element and for reflecting the remainder of the light; a reflection portion, provided on said first surface, for receiving said remainder of said light reflected by said semi-transmission portion and reflecting it toward said second photo detector; a focal point of said light having been reflected at the optical disk and passed through said holographic optical element residing on an optical path between said semi-transmission portion and said second photo sensor; and said first and second photo detectors detecting focusing error and tracking error as well as information recorded on the optical disk.

Claim 16

An optical pick-up apparatus in accordance with claim 11, further comprising a phase difference control film, provided on said light guide, for controlling a phase difference between polarized components of the light emitted from said light emitting element.

Claim 17

An optical pick-up apparatus in accordance with claim 11, wherein all the second surface of the light guide except for light reflection and light transmitting regions is coated by a light shielding film.

Claim 18

An optical pick-up apparatus in accordance with claim 11, wherein light quantity distributions of the light emitted from said light emitting element is elliptic formation on a plane normal to an optical axis of this light, and a minor axis of said elliptic formation is aligned on a plane including an optical axis of the light in an optical path starting from said light emitting element and arriving at said compound hologram.

Claim 19

An optical pick-up apparatus in accordance with claim 11, wherein said light emitting element and said first and second photo detectors are spaced from said light guide.

Claim 20

An optical pick-up apparatus in accordance with claim 11, wherein said light emitting element and said first and second photo detectors are spaced from said light guide, and there is provided an incident light reflection member for reflecting the light emitted from said light emitting element toward said light guide so as to lead it into the light guide.

Claim 21

An optical pick-up apparatus in accordance with claim 11, further comprising an incident light reflection member for reflecting the light emitted from said light emitting element toward said light guide so as to lead it into the light guide, and said light emitting element and said incident light reflection member are disposed on a sensor substrate on which said first and second photo detectors are provided.

Claim 22

An optical pick-up apparatus in accordance with claim 11, further comprising a trapezoidal prism having an inclined reflection surface, on which semi-transmission film is coated, for reflecting the light emitted from said light emitting element toward said light guide so as to lead it into the light guide, said light emitting element and said trapezoidal prism being disposed on a sensor substrate on which said first and second photo detectors are provided, and a light quantity monitor sensor being formed on said sensor substrate at a region which a bottom of said prism contacts with, thereby transmitting a part of the light emitted from said light emitting element into said trapezoidal prism to detect light quantity by said light quantity monitor sensor.

Claim 23

An optical pick-up apparatus in accordance with claim 11, wherein said semi-transmission portion includes a semi-transmission film, said semi-transmission film is laminated by a diffusion film diffusing the light beam and having a window at a center thereof whose diameter is smaller than that of the light arriving from the optical disk, said diffusion film has an outer diameter greater than that of said light arriving from the optical disk, and further said first photo detector senses the light transmitting through said window and said second photo detector senses the light diffused by said diffusion film so as to detect focusing error on the basis of the difference of light quantity between two photo detectors.

Claim 24

An optical pick-up apparatus comprising: a light emitting element for emitting a linearly polarized light supplied to an optical disk; first and second photo detectors for receiving the light reflected at said optical disk; a transparent light guide having two surfaces, a first surface of which confronts with said optical disk and a second surface of which confronts with said light emitting element and said two photo detectors, for guiding the light emitted from said light emitting element onto said optical disk by use of a plurality of reflections caused inside thereof and also guiding the light reflected at the optical disk toward said two photo detectors; a compound holographic optical element, provided on said first surface, whose hologram pattern is a superposition of a first hologram pattern for converging the light emitted from the light emitting element onto the optical disk and a second hologram pattern for diffracting the light having been reflected at the optical disk in a direction inclined at an angle of (2n+1)π/4, wherein n is an integer, with respect to a polarization direction of said linearly polarized light and changing it into a focusing light; a polarized beam splitter, provided on said second surface, for transmitting either one of P-polarized component and S-polarized component of the light having been reflected at the optical disk and passed through said holographic optical element and for reflecting the other of said P-polarized component and S-polarized component; a reflection portion, provided on said first surface, for receiving said light reflected by said polarized beam splitter and reflecting it toward said second photo detector; a focal point of said light having been reflected at the optical disk and passed through said holographic optical element residing on an optical path between said polarized beam splitter and said second photo sensor; and said first and second photo detectors detecting focusing error and tracking error as well as information recorded on the optical disk.

Claim 25

An optical pick-up apparatus comprising: a light emitting element for emitting a linearly polarized light supplied to an optical disk; first and second photo detectors for receiving the light reflected at said optical disk; a transparent light guide having two surfaces, a first surface of which confronts with said optical disk and a second surface of which confronts with said light emitting element and said two photo detectors, for guiding the light emitted from said light emitting element onto said optical disk by use of a plurality of reflections caused inside thereof and also guiding the light reflected at the optical disk toward said two photo detectors; a compound holographic optical element, provided on said first surface, whose hologram pattern is a superposition of a first hologram pattern for converging the light emitted from the light emitting element onto the optical disk and a second hologram pattern for diffracting the light having been reflected at the optical disk in a direction inclined at an angle of (2n+1)π/4, wherein n is an integer, with respect to a polarization direction of said linearly polarized light and changing it into a focusing light; a polarized beam splitter, provided on said second surface, for transmitting either one of P-polarized component and S-polarized component of the light having been reflected at the optical disk and passed through said holographic optical element and for reflecting the other of said P-polarized component and S-polarized component; a reflection portion, provided on said first surface, for receiving said light reflected by said polarized beam splitter and reflecting it toward said second photo detector; a focal point of said light having been reflected at the optical disk and passed through said holographic optical element residing on an optical path between said polarized beam splitter and said second photo sensor; and said first and second photo detectors detecting focusing error and tracking error as well as information recorded on the optical disk.

Claim 26

An optical pick-up apparatus in accordance with claim 20, wherein said light emitting element and said first and second photo detectors are spaced from said light guide.

Claim 27

An optical pick-up apparatus in accordance with claim 20, wherein said light emitting element and said first and second photo detectors are spaced from said light guide, and there is provided an incident light reflection member for reflecting the light emitted from said light emitting element toward said light guide so as to lead it into the light guide.

Claim 28

An optical pick-up apparatus in accordance with claim 20, further comprising an incident light reflection member for reflecting the light emitted from said light emitting element toward said light guide so as to lead it into the light guide, and said light emitting element and said incident light reflection member are disposed on a sensor substrate on which said first and second photo detectors are provided.

Claim 29

An optical pick-up apparatus in accordance with claim 20, further comprising a trapezoidal prism having an inclined reflection surface, on which semi-transmission film is coated, for reflecting the light emitted from said light emitting element toward said light guide so as to lead it into the light guide, said light emitting element and said trapezoidal prism being disposed on a sensor substrate on which said first and second photo detectors are provided, and a light quantity monitor sensor being formed on said sensor substrate at a region which a bottom of said prism contacts with, thereby transmitting a part of the light emitted from said light emitting element into said trapezoidal prism to detect light quantity by said light quantity monitor sensor.

Claim 30

An optical pick-up apparatus in accordance with claim 20, wherein said polarized beam splitter includes a polarized beam splitting film, said polarized beam splitting film is laminated by a diffusion film diffusing the light beam and having a window at a center thereof whose diameter is smaller than that of the light arriving from the optical disk, said diffusion film has an outer diameter greater than that of said light arriving from the optical disk, and further said first photo detector senses the light transmitting through said window and said second photo detector senses the light diffused by said diffusion film so as to detect focusing error on the basis of the difference of light quantity between two photo detectors.

Claim 31

An optical pick-up apparatus comprising: a light emitting element for emitting a linearly polarized light supplied to an optical disk; first and second photo detectors for receiving the light reflected at said optical disk; a transparent light guide having two surfaces, a first surface of which confronts with said optical disk and a second surface of which confronts with said light emitting element and said two photo detectors, for guiding the light emitted from said light emitting element onto said optical disk and also guiding the light reflected at the optical disk toward said two photo detectors; a compound holographic optical element, provided on said first surface, whose hologram pattern is a superposition of a first hologram pattern for converging the light emitted from the light emitting element onto the optical disk and a second hologram pattern for diffracting the light having been reflected at the optical disk in a direction inclined at an angle of (2n+1)π/4, wherein n is an integer, with respect to a polarization direction of said linearly polarized light and changing it into a focusing light; a polarized beam splitter, provided on said second surface, for transmitting either one of P-polarized component and S-polarized component of the light having been reflected at the optical disk and passed through said holographic optical element toward said first photo detector and for reflecting the other of said P-polarized component and S-polarized component; a reflection portion, provided on said first surface, for receiving said light reflected by said polarized beam splitter an d reflecting it toward said second photo detector; a focal point of said light having been reflected at the optical disk and passed through said holographic optical element residing on an optical path between said polarized beam splitter and said second photo sensor; and said first and second photo detectors detecting focusing err or and tracking error as well as information recorded on the optical disk.

Claim 32

An optical pick-up apparatus comprising: a light emitting element for emitting a linearly polarized light supplied to an optical disk; first and second photo detectors for receiving the light reflected at said optical disk; a transparent light guide having two surfaces, a first surface of which confronts with said optical disk and a second surface of which confronts with said light emitting element and said two photo detectors, for guiding the light emitted from said light emitting element onto said optical disk and also guiding the light reflected at the optical disk toward said two photo detectors; a compound holographic optical element, provided on said first surface, whose hologram pattern is a superposition of a first hologram pattern for converging the light emitted from the light emitting element onto the optical disk and a second hologram pattern for diffracting the light having been reflected at the optical disk in a direction inclined at an angle of (2n+1)π/4, wherein n is an integer, with respect to a polarization direction of said linearly polarized light and changing it into a focusing light; a polarized beam splitter, provided on said second surface, for transmitting either one of P-polarized component and S-polarized component of the light having been reflected at the optical disk and passed through said holographic optical element toward said first photo detector and for reflecting the other of said P-polarized component and S-polarized component; a reflection portion, provided on said first surface, for receiving said light reflected by said polarized beam splitter an d reflecting it toward said second photo detector; a focal point of said light having been reflected at the optical disk and passed through said holographic optical element residing on an optical path between said polarized beam splitter and said second photo sensor; and said first and second photo detectors detecting focusing err or and tracking error as well as information recorded on the optical disk.

Claim 33

An optical pick-up apparatus in accordance with claim 26, further comprising a phase difference control film, provided on said light guide, for controlling a phase difference between polarized components of the light emitted from said light emitting element.

Claim 34

An optical pick-up apparatus in accordance with claim 26, wherein all the second surface of the light guide except for light reflection and light transmitting regions is coated by a light shielding film.

Claim 35

An optical pick-up apparatus in accordance with claim 26, wherein light quantity distributions of the light emitted from said light emitting element is elliptic formation on a plane normal to an optical axis of this light, and a minor axis of said elliptic formation is aligned on a plane including an optical axis of the light in an optical path starting from said light emitting element and arriving at said compound hologram.

Claim 36

An optical pick-up apparatus in accordance with claim 26, wherein said light emitting element and said first and second photo detectors are spaced from said light guide.

Claim 37

An optical pick-up apparatus in accordance with claim 26, wherein said light emitting element and said first and second photo detectors are spaced from said light guide, and there is provided an incident light reflection member for reflecting the light emitted from said light emitting element toward said light guide so as to lead it into the light guide.

Claim 38

An optical pick-up apparatus in accordance with claim 26, further comprising an incident light reflection member for reflecting the light emitted from said light emitting element toward said light guide so as to lead it into the light guide, and said light emitting element and said incident light reflection member are disposed on a sensor substrate on which said first and second photo detectors are provided.

Claim 39

An optical pick-up apparatus in accordance with claim 26, further comprising a trapezoidal prism having an inclined reflection surface, on which semi-transmission film is coated, for reflecting the light emitted from said light emitting element toward said light guide so as to lead it into the light guide, said light emitting element and said trapezoidal prism being disposed on a sensor substrate on which said first and second photo detectors are provided, and a light quantity monitor sensor being formed on said sensor substrate at a region which a bottom of said prism contacts with, thereby transmitting a part of the light emitted from said light emitting element into said trapezoidal prism to detect light quantity by said light quantity monitor sensor.

Claim 40

An optical pick-up apparatus in accordance with claim 26, wherein said polarized beam splitter includes a polarized beam splitting film, said polarized beam splitting film is laminated by a diffusion film diffusing the light beam and having a window at a center thereof whose diameter is smaller than that of the light arriving from the optical disk, said diffusion film has an outer diameter greater than that of said light arriving from the optical disk, and further said first photo detector senses the light transmitting through said window and said second photo detector senses the light diffused by said diffusion film so as to detect focusing error on the basis of the difference of light quantity between two photo detectors.

Claim 41

An optical pick-up apparatus comprising: a light emitting element for emitting a linearly polarized light supplied to an optical disk; first and second photo detectors for receiving the light reflected at said optical disk; a transparent light guide having two surfaces, a first surface of which confronts with said optical disk and a second surface of which confronts with said light emitting element and said two photo detectors, for guiding the light emitted from said light emitting element onto said optical disk and also guiding the light reflected at the optical disk toward said two photo detectors; a polarized beam splitting film, coated on second surface, for transmitting either one of P-polarized component and S-polarized component of the light emitted from said light emitting element and reflecting the other of said P-polarized component and S-polarized component; a compound holographic optical element, provided on said first surface, whose hologram pattern is a superposition of a first hologram pattern for converging the light having been emitted from the light emitting element and reflected at said polarized beam splitting film onto the optical disk and a second hologram pattern for diffracting the light having been reflected at the optical disk in a direction inclined at an angle of (2n+1)π/4, wherein n is an integer, with respect to a polarization direction of said linearly polarized light and changing it into a focusing light; a polarized beam splitter, provided on said second surface, for transmitting either one of P-polarized component and S-polarized component of the light having been reflected at the optical disk and passed through said holographic optical element toward said first photo detector and for reflecting the other of said P-polarized components and S-polarized components; a reflection portion, provided on said first surface, for receiving said light reflected by said polarized beam splitter and reflecting it toward said second photo detector; a transmission window, provided on said second surface, for guiding said light reflected at said reflection portion toward said second photo detector; a focal point of said light having been reflected at the optical disk and passed through said holographic optical element residing on an optical path between said polarized beam splitter and said second photo sensor; and said first and second photo detectors detecting focusing error and tracking error as well as information recorded on the optical disk.

Claim 42

An optical pick-up apparatus comprising: a light emitting element for emitting a linearly polarized light supplied to an optical disk; first and second photo detectors for receiving the light reflected at said optical disk; a transparent light guide having two surfaces, a first surface of which confronts with said optical disk and a second surface of which confronts with said light emitting element and said two photo detectors, for guiding the light emitted from said light emitting element onto said optical disk and also guiding the light reflected at the optical disk toward said two photo detectors; a polarized beam splitting film, coated on second surface, for transmitting either one of P-polarized component and S-polarized component of the light emitted from said light emitting element and reflecting the other of said P-polarized component and S-polarized component; a compound holographic optical element, provided on said first surface, whose hologram pattern is a superposition of a first hologram pattern for converging the light having been emitted from the light emitting element and reflected at said polarized beam splitting film onto the optical disk and a second hologram pattern for diffracting the light having been reflected at the optical disk in a direction inclined at an angle of (2n+1)π/4, wherein n is an integer, with respect to a polarization direction of said linearly polarized light and changing it into a focusing light; a polarized beam splitter, provided on said second surface, for transmitting either one of P-polarized component and S-polarized component of the light having been reflected at the optical disk and passed through said holographic optical element toward said first photo detector and for reflecting the other of said P-polarized components and S-polarized components; a reflection portion, provided on said first surface, for receiving said light reflected by said polarized beam splitter and reflecting it toward said second photo detector; a transmission window, provided on said second surface, for guiding said light reflected at said reflection portion toward said second photo detector; a focal point of said light having been reflected at the optical disk and passed through said holographic optical element residing on an optical path between said polarized beam splitter and said second photo sensor; and said first and second photo detectors detecting focusing error and tracking error as well as information recorded on the optical disk.

Claim 43

An optical pick-up apparatus in accordance with claim 35, wherein all the second surface of the light guide except for light reflection and light transmitting regions is coated by a light shielding film.

Claim 44

An optical pick-up apparatus in accordance with claim 35, wherein light quantity distributions of the light emitted from said light emitting element is elliptic formation on a plane normal to an optical axis of this light, and a minor axis of said elliptic formation is aligned on a plane including an optical axis of the light in an optical path starting from said light emitting element and arriving at said compound hologram.

Claim 45

An optical pick-up apparatus in accordance with claim 35, wherein said light emitting element and said first and second photo detectors are spaced from said light guide.

Claim 46

An optical pick-up apparatus in accordance with claim 35, wherein said light emitting element and said first and second photo detectors are spaced from said light guide, and there is provided an incident light reflection member for reflecting the light emitted from said light emitting element toward said light guide so as to lead it into the light guide.

Claim 47

An optical pick-up apparatus in accordance with claim 35, further comprising an incident light reflection member for reflecting the light emitted from said light emitting element toward said light guide so as to lead it into the light guide, and said light emitting element and said incident light reflection member are disposed on a sensor substrate on which said first and second photo detectors are provided.

Claim 48

An optical pick-up apparatus in accordance with claim 35, further comprising a trapezoidal prism having an inclined reflection surface, on which semi-transmission film is coated, for reflecting the light emitted from said light emitting element toward said light guide so as to lead it into the light guide, said light emitting element and said trapezoidal prism being disposed on a sensor substrate on which said first and second photo detectors are provided, and a light quantity monitor sensor being formed on said sensor substrate at a region which a bottom of said prism contacts with, thereby transmitting a part of the light emitted from said light emitting element into said trapezoidal prism to detect light quantity by said light quantity monitor sensor.

Claim 49

An optical pick-up apparatus in accordance with claim 35, wherein said polarized beam splitter includes a polarized beam splitting film, said polarized beam splitting film is laminated by a diffusion film diffusing the light beam and having a window at a center thereof whose diameter is smaller than that of the light arriving from the optical disk, said diffusion film has an outer diameter greater than that of said light arriving from the optical disk, and further said first photo detector senses the light transmitting through said window and said second photo detector senses the light diffused by said diffusion film so as to detect focusing error on the basis of the difference of light quantity between two photo detectors.

Claim 50

An optical pick-up apparatus in accordance with claim 35, wherein the linearly polarized beam of said light emitted from said light emitting element is S-polarized component with respect to the second surface of said light guide, and said polarized beam splitting film coated on said second surface and said polarized beam splitter transmit the P-polarized component and reflect the S-polarized component.

Claim 51

An optical pick-up apparatus in accordance with claim 35, wherein said polarized beam splitting film coated on said second surface and a polarized beam splitting film constituting said polarized beam splitter are formed continuously by the same material.