Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
184 words
A projector-type headlamp, comprising: a concave mirror having an inner reflecting surface, an apex and an axis a lamp bulb as light source of which a center nearly falls on the axis of said concave mirror; and a convex lens so disposed as to have an optical axis thereof nearly coincident with the axis of said concave mirror, the inner reflecting surface of said concave mirror being composed, at an area near the apex, of a central spherical area formed by a part of a spherical surface and having a center thereof disposed on the axis of said concave mirror and a composite ellipsoidal surface of revolution formed by parts of a plurality of ellipsoidal surfaces of revolution smoothly joined to each other for junction with said central spherical area, having a common focus at the center of said spherical area and other foci at positions spaced a predetermined distance from said common focus toward said convex lens, said lamp bulb being having the center thereof disposed near said common focus and said convex lens having the focus thereof disposed near said common focus.
Claim 2
Dependent Claim
184 words
A projector-type headlamp, comprising: a concave mirror having an inner reflecting surface, an apex and an axis a lamp bulb as light source of which a center nearly falls on the axis of said concave mirror; and a convex lens so disposed as to have an optical axis thereof nearly coincident with the axis of said concave mirror, the inner reflecting surface of said concave mirror being composed, at an area near the apex, of a central spherical area formed by a part of a spherical surface and having a center thereof disposed on the axis of said concave mirror and a composite ellipsoidal surface of revolution formed by parts of a plurality of ellipsoidal surfaces of revolution smoothly joined to each other for junction with said central spherical area, having a common focus at the center of said spherical area and other foci at positions spaced a predetermined distance from said common focus toward said convex lens, said lamp bulb being having the center thereof disposed near said common focus and said convex lens having the focus thereof disposed near said common focus.
Claim 3
Dependent Claim
71 words
A projector-type headlamp as set forth in claim 1, wherein the inner reflecting surface of said concave mirror has a profile as viewed from the center of said convex lens is generally a horizontally elongated rectangle and each of said plural different ellipsoidal surfaces of revolution are joined to the other adjoining ellipsoidal surface of revolution in a vertical plane parallel to a vertical plane in which said optical axis lies.
Claim 4
Dependent Claim
37 words
A projector-type headlamp as set forth in claim 2, wherein each of said ellipsoidal surfaces of revolution is composed of two elliptical reflecting areas symmetrical with respect to the vertical plane in which said optical axis lies.
Claim 5
Dependent Claim
41 words
A projector-type headlamp as set forth in claim 3, wherein the two foci of each of said plural ellipsoidal surfaces of revolution are separated by a distance which becomes gradually larger as it goes further away from said central spherical area.
Claim 6
Dependent Claim
40 words
A projector-type headlamp as set forth in claim 4, wherein the other focus of the ellipsoidal surface of revolution formed at a position far from said central spherical area is located ahead of a back surface of said convex lens.
Claim 7
Dependent Claim
128 words
A projector-type headlamp as set forth in claim 5, wherein a first angle of viewing from said common focus to both end points of a line of intersection between the vertical plane in which said optical axis lies and said central spherical area is generally equal to an angle of viewing from said common focus to both end points of a line of intersection between said convex lens and the horizontal plane in which said optical axis lies, and a second angle of viewing from said common focus to both end points of a line of intersection between a horizontal plane in which said optical axis lies and the ellipsoidal surface of revolution located at the farthest position from said central spherical area is substantially about 180 degrees.
Claim 8
Dependent Claim
60 words
A projector-type headlamp as set forth in claim 6, further comprising supplemental reflecting surfaces joined to the ellipsoidal surface of revolution formed at a position farthest from said central spherical area and which reflect toward any of said plural ellipsoidal surfaces of revolution rays emitted from said lamp bulb in directions exceeding said first angle and toward said convex lens.
Claim 9
Dependent Claim
32 words
A projector-type headlamp as set forth in claim 7, wherein said supplemental reflecting surfaces are formed as a part of a spherical surface having the center thereof located near said common focus.