Electrically controlled shutter for use in photographic cameras

Claim 2

An electrically controlled shutter for a photographic camera, comprising: a first timing circuit for setting exposure timing commensurate with the brightness of a photographic object; a second timing circuit for manually setting exposure timing; an exposure time control circuit for controlling exposure in accordance with the exposure timing of said first or second timing circuit; means for closing the shutter in response to said exposure time control circuit; a first manually operative member settable to a desired position for selecting exposure time and for selectively connecting at least said second timing circuit to said exposure time control circuit; and a second manually operative member movable from a rest position to an operating position for connecting said first timing circuit to said exposure time control circuit to override the control setting of said second timing circuit; first and second shutter releasing members; and said second manually operative member being additionally manually movable to a third position enabling said second shutter releasing member to release the shutter independently of said first shutter releasing member with said first timing circuit connected to said exposure time control circuit.

Claim 3

An electrically controlled shutter as in claim 1, wherein said shutter further comprises: a retaining member for retaining said second manually operative member in said operating position.

Claim 4

An electrically controlled shutter as in claim 1, wherein said shutter further comprises: means for releasing said second manually operative member from being retained in said operating position thereof by said retaining member.

Claim 5

An electrically controlled shutter as in claim 1, wherein said shutter further comprises: a member for manually releasing said second manually operative member from being retained in said operating position thereof by said retaining member.

Claim 6

An electrically controlled shutter as in claim 1, wherein said camera is a single lens reflex camera provided with a mirror movable to a viewing position and to a picture taking position and with aN adjusting means for adjusting a diaphragm aperture from the full open position to a preset aperture setting, and wherein the change from the viewing condition to the picture taking condition is in cooperation with the shutter release operation, wherein said shutter further comprises: a light measuring circuit including a light receiving element for receiving scene light transmitted through an objective lens of the camera and for producing an output voltage proportional to the logarithmic value of the luminance at the light receiving surface of said light receiving element; means for storing said output voltage, said first timing circuit establishes timing by antilogarithmically converting said stored output voltage; a first switch means connected between said light measuring circuit and said means for storing and having a tendency to be closed and opened before said mirror moves from said viewing position to said picture taking position in cooperation with the shutter release operation; and a second switch means connected to said light measuring circuit and said means for storing in series with said first switch means and said second switch means is closed and opened when said second manually operative member is in said rest position and in said operating position thereof respectively.

Claim 7

An electrically controlled shutter as in claim 1 wherein said second manually operative member moves through said operating position to said third position from said rest position.

Claim 8

An electrically controlled shutter as in claim 1 wherein said first manually operative member is settable to another position for connecting said first timing circuit to said exposure time control circuit.

Claim 9

An electrically controlled shutter for a photographic camera, comprising: a first timing circuit for setting exposure timing commensurate with the brightness of a photographic object; a second timing circuit for manually setting exposure timing; an exposure time control circuit for controlling exposure in accordance with the exposure timing of said first or second timing circuit; means for closing the shutter in response to said exposure time control circuit; a first manually operative member settable to a desired position for selecting exposure time and for selectively connecting at least said second timing circuit to said exposure time control circuit; and a second manually operative member for setting automatic exposure control and for connecting said first timing circuit to said exposure time control circuit, said second manually operative member is at least movable from a rest position to an operating position to connect said first timing circuit to said exposure time control circuit for over-riding the setting of said first manually operative member; a retaining member for retaining said second manually operative member in said operating position; and means for releasing said second manually operative member from being retained in said operating position thereof by said retaining member.

Claim 10

An electrically controlled shutter for a photographic camera, comprising: a first timing circuit for setting exposure timing commensurate with the brightness of a photographic object; a second timing circuit for manually setting exposure timing; an exposure time control circuit for controlling exposure in accordance with the exposure timing of said first or second timing circuit; means for closing the shutter in response to said exposure time control circuit; a first manually operative member settable to a desired position for selecting exposure time and for selectively connecting at least said second timing circuit to said exposure time control circuit; and a second manually operative member for setting automatic exposure control and for connecting said first timing circuit to said exposure time control circuit, said second manually operative member is at least movable from a rest position to an operating position to connect said first timing circuit to said exposure time control circuit for over-riding the setting of said first manually operative member; a retaining member for retaining said second manually operative member in said operating position; and means for releasing said second manually operative member from being retained in said operating position thereof by said retaining member.

Claim 11

An electrically controlled shutter as in claim 8 wherein said first manually operative member is settable to another position for connecting said first timing circuit to said exposure time control circuit.

Claim 12

An electrically controlled shutter as in claim 8 wherein said means for releasing is a third manually operative member.

Claim 13

An electrically controlled shutter as in claim 10 wherein said first manually operative member is settable to another position for connecting said first timing circuit to said exposure time control circuit.

Claim 14

An electrically controlled shutter for a photographic camera of the single lens reflex type provided with a mirror movable to a viewing position and to a picture taking position and with an adjusting means for adjusting a diaphragm aperture from the full open position to a preset aperture setting, and wherein the change from the viewing condition to the picture taking condition is in cooperation with the shutter release operation, comprising: a first timing circuit for setting exposure timing commensurate with the brightness of a photographic object; a second timing circuit for manually setting exposure timing; an exposure time control circuit for controlling exposure in accordance with the exposure timing of said first or second timing circuit; means for closing the shutter in response to said exposure time control circuit; a first manually operative member settable to a desired position for selecting exposure time and for selectively connecting at least said second timing circuit to said exposure time control circuit; a second manually operative member for setting automatic exposure control and for connecting said first timing circuit to said exposure time control circuit, said second manually operative member is at least movable from a rest position to an operating position to connect said first timing circuit to said exposure time control circuit for overriding the setting of said first manually operative member; a light measuring circuit including a light receiving element for receiving scene light transmitted through an objective lens of the camera and for producing an output voltage proportional to the logarithmic value of the luminance at the light receiving surface of said light receiving element; means for storing said output voltage, said first timing circuit establishing timing by antilogarithmically converting said stored output voltage; a first switch means connected between said light measuring circuit and said means for storing and having a tendency to be closed and opened before said mirror moves from said viewing position to said picture taking position in cooperation with the shutter release operation; and a second switch means connected to said light measuring circuit and said means for storing in series with said first switch means and said second switch means is closed and opened when said second manually operative member is in said rest position and in said operating position thereof, respectively.

Claim 15

An electrically controlled shutter for a photographic camera of the single lens reflex type provided with a mirror movable to a viewing position and to a picture taking position and with an adjusting means for adjusting a diaphragm aperture from the full open position to a preset aperture setting, and wherein the change from the viewing condition to the picture taking condition is in cooperation with the shutter release operation, comprising: a first timing circuit for setting exposure timing commensurate with the brightness of a photographic object; a second timing circuit for manually setting exposure timing; an exposure time control circuit for controlling exposure in accordance with the exposure timing of said first or second timing circuit; means for closing the shutter in response to said exposure time control circuit; a first manually operative member settable to a desired position for selecting exposure time and for selectively connecting at least said second timing circuit to said exposure time control circuit; a second manually operative member for setting automatic exposure control and for connecting said first timing circuit to said exposure time control circuit, said second manually operative member is at least movable from a rest position to an operating position to connect said first timing circuit to said exposure time control circuit for overriding the setting of said first manually operative member; a light measuring circuit including a light receiving element for receiving scene light transmitted through an objective lens of the camera and for producing an output voltage proportional to the logarithmic value of the luminance at the light receiving surface of said light receiving element; means for storing said output voltage, said first timing circuit establishing timing by antilogarithmically converting said stored output voltage; a first switch means connected between said light measuring circuit and said means for storing and having a tendency to be closed and opened before said mirror moves from said viewing position to said picture taking position in cooperation with the shutter release operation; and a second switch means connected to said light measuring circuit and said means for storing in series with said first switch means and said second switch means is closed and opened when said second manually operative member is in said rest position and in said operating position thereof, respectively.

Claim 16

An electrically controlled shutter as in claim 12, wherein said first manually operative member is adapted to selectively connect said first timing circuit to said exposure time control circuit and said second manually operative member connects said first or second timing circuit selected by said first manually operative member to said exposure time control circuit in the rest position thereof.