FIXED-FOCUS LENS AND APPARATUS INTEGRATING OPTICAL PROJECTION AND IMAGE DETECTION
First Claim
1. A fixed-focus lens adapted to be disposed between an object side and an image side, the fixed-focus lens comprising:
- a reflector disposed in a light path between the object side and the image side;
a curved reflector disposed in the light path between the reflector and the image side;
a first lens group disposed in the light path between the curved reflector and the image side and comprising a first lens and a second lens arranged in sequence from the object side to the image side, wherein each of the first lens and the second lens is an aspheric lens; and
a second lens group disposed in the light path between the first lens group and the image side and comprising a spherical lens and an aspheric lens, wherein the aspheric lens of the second lens group is closest to the image side in the second lens group,wherein an effective focal length of the fixed-focus lens is f, an effective focal length of the second lens group is f2, a clear aperture of the aspheric lens of the second lens group is D, and the fixed-focus lens satisfies at least one of following conditions;
0.04<
f/f2<
0.078 and 0.05<
f/D<
0.18.
1 Assignment
0 Petitions
Accused Products
Abstract
A fixed-focus lens disposed between an object side and an image side is provided. The fixed-focus lens includes a reflector, a curved reflector, a first lens group, and a second lens group disposed in sequence from the object side to the image side. The first lens group includes two aspheric lenses. The second lens group includes a spherical lens and an aspheric lens, wherein the aspheric lens of the second lens group is closest to the image side in the second lens group. Besides, an effective focal length (EFL) of the fixed-focus lens is f, an EFL of the second lens group is f2, and a clear aperture of the aspheric lens of the second lens group is D. The fixed-focus lens satisfies one of following conditions: 0.04<f/f2<0.078 and 0.05<f/D<0.18. An apparatus integrating optical projection and image detection is provided.
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Citations
25 Claims
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1. A fixed-focus lens adapted to be disposed between an object side and an image side, the fixed-focus lens comprising:
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a reflector disposed in a light path between the object side and the image side; a curved reflector disposed in the light path between the reflector and the image side; a first lens group disposed in the light path between the curved reflector and the image side and comprising a first lens and a second lens arranged in sequence from the object side to the image side, wherein each of the first lens and the second lens is an aspheric lens; and a second lens group disposed in the light path between the first lens group and the image side and comprising a spherical lens and an aspheric lens, wherein the aspheric lens of the second lens group is closest to the image side in the second lens group, wherein an effective focal length of the fixed-focus lens is f, an effective focal length of the second lens group is f2, a clear aperture of the aspheric lens of the second lens group is D, and the fixed-focus lens satisfies at least one of following conditions;
0.04<
f/f2<
0.078 and 0.05<
f/D<
0.18. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An apparatus integrating optical projection and image detection, the apparatus comprising:
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a fixed-focus lens adapted to be disposed between an object side and an image side so as to image an object beam from the object side on the image side, the fixed-focus lens comprising; a reflector disposed in a light path of the object beam between the object side and the image side; a curved reflector disposed in the light path of the object beam between the reflector and the image side; and a first lens group disposed in the light path of the object beam between the curved reflector and the image side and comprising a first lens and a second lens arranged in sequence from the object side to the image side, wherein each of the first lens and the second lens is an aspheric lens; a second lens group disposed in the light path of the object beam between the first lens group and the image side and comprising a spherical lens and an aspheric lens, wherein the aspheric lens of the second lens group is closest to the image side in the second lens group; and a dichroic mirror disposed in the light path of the object beam between the first lens group and the second lens group, wherein an effective focal length of the fixed-focus lens is f, an effective focal length of the second lens group is f2, a clear aperture of the aspheric lens of the second lens group is D, and the fixed-focus lens satisfies at least one of following conditions;
0.04<
f/f2<
0.078 and 0.05<
f/D<
0.18;a light detector disposed at the image side; and an optical engine adapted to emit an image beam, wherein the image beam is transmitted to the dichroic mirror, the dichroic mirror is capable of allowing the image beam to be transmitted to the first lens group, and the image beam is capable of passing through the first lens group and is reflected to the object side by the reflector and the curved reflector. - View Dependent Claims (22, 23, 24, 25)
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Specification