CN2511990Y

CN2511990Y - Digital camera lens

Info

Publication number: CN2511990Y
Application number: CN 01272836
Authority: CN
Inventors: 陈天庆
Original assignee: Yujing Optoelectronics Xiamen Co ltd
Current assignee: Yujing Optoelectronics Xiamen Co ltd
Priority date: 2001-12-13
Filing date: 2001-12-13
Publication date: 2002-09-18
Anticipated expiration: 2011-12-13

Abstract

The utility model discloses a digital camera lens comprising a fixed aperture and an optical module, wherein the optical module comprises a first lens, a second lens and a third lens; from the object space, a biconvex lens, a biconcave lens, and a convex lens are arranged in sequence; the fixed aperture is arranged in the front of the first lens. With the structure, only three lens are needed, and as the fixed aperture is arranged in the front of the first lens, the structure of the camera lens is simple, and the volume is smaller( the overall length is shorter), and assembly technology is simple. The lens of the utility model adopts the unique structure of a spherical mirror and an aspherical mirror, and the aspherical mirror is molded by optical plastics, which can lower the cost greatly; at the same time, optical distortion and refractive index are lowered, image quality is improved; the utility model is in particular applicable to minitype digital camera lens such as digital cameras, mobile phones, PC cameras and palm computers.

Description

A kind of digital image camera lens

Technical field

The utility model relates to a kind of fixed focal length camera lens, particularly a kind of camera lens that is applied to digital camera or uses for PC camera or digital image products such as mobile phone, palm PC.

Background technology

In recent years, along with personal computer family progressively popularizes, the numerical digit still camera was also slowly come into people's life.Numerical digit still camera (DSC) can obtain the picture of object by a solid-state image pickup apparatus (as CCD and CMOS), the picture that will get access to is input to personal computer by a data line again, and personal computer converts thereof into accessible JPG or GIF or TIFF graphic file by corresponding software.Yet because the numerical digit still camera develops towards microminiaturization, this just requires the solid-state image pickup apparatus and the taking lens of phase configuration with it also more and more littler, and promptly the volume of solid-state image pickup apparatus is further little, and the length overall of taking lens also will further be lacked.Yet the length overall of taking lens is short more, and the distance between its back Jiao reaches from the imaging surface to the exit pupil position just is difficult to reach corresponding requirement, and its optical property just is difficult to reach corresponding requirement equally.In the prior art, for cooperating above purpose, taking lens generally uses more eyeglass number, and diaphragm is placed between the eyeglass.Its weak point is when a diaphragm places between the eyeglass, and there is a very big space its front or back, and this has just increased the size of total system, and causes camera lens cumulative volume and assembly technology difficulty to become big; The quantity of eyeglass is in a single day more, and then the total length of camera lens also strengthens accordingly, and cost also increases thereupon.

Summary of the invention

The purpose of this utility model is to provide that a kind of volume is little, cost is low, assembly technology is simply applicable to the camera lens of small-sized digital image products such as small digital cameras, PC camera, mobile phone, palm PC.

A kind of digital image camera lens comprises a fixed aperture and an optical group, and optical group comprises first, second and prismatic glasses, and from object space, first eyeglass is a biconvex lens, is positioned at the top of camera lens, is made by glass material; Second eyeglass is a biconcave lens; Prismatic glasses is convex lens, and its radius-of-curvature ratio towards picture side's side is big towards the radius-of-curvature of the object space side, and is positioned at the end of camera lens; Said fixed aperture is positioned at the place ahead of first eyeglass; Described second and third eyeglass is made by plastic material, and has at least a surface to be aspheric surface.

After adopting said structure, the quantity of eyeglass only needs three, and diaphragm is placed the place ahead, makes that lens construction is simple, smaller volume (total length is little), assembly technology be simple; The spherical mirror that the utility model adopts adds the unique texture of aspheric mirror, and aspheric surface employing optical plastic is injection molded, makes processing technology simple, and has reduced cost widely; Simultaneously, also can reduce optical distortion and refractive index, its quality of image also is improved, and is specially adapted to small-sized digital image products such as digital camera, mobile phone, PC camera and palm PC.

Description of drawings

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is an embodiment synoptic diagram of the present utility model.

Embodiment

As shown in Figure 1, a kind of digital image camera lens, comprise a fixed aperture 1 and an optical group 2, optical group comprises first, second and prismatic glasses, and from object space, first eyeglass 21 is positioned at the top of camera lens for biconvex lens, second eyeglass 22 is a biconcave lens, prismatic glasses 23 is convex lens, and its radius-of-curvature ratio towards picture side's side is big towards the radius-of-curvature of the object space side, and is positioned at the end of camera lens; Fixed aperture is positioned at the place ahead of first eyeglass 21.Wherein, first eyeglass 21 adopts glass material to make, and two surfaces are sphere; Second eyeglass 22 and prismatic glasses 23 are injection molded by optical plastic, and second eyeglass 22 and prismatic glasses 23 to have a surface at least be aspheric surface.

As shown in Figure 2, above-mentioned camera lens is built in the digital camera lens housing 3.Housing 3 is formed by connecting with following 32 by loam cake 31, and housing is provided with packing ring 4, is used for the fixing of 2 positions of eyeglass.Wherein, first eyeglass 21 adopts glass material to make, and two surfaces are sphere; Second eyeglass 22 and prismatic glasses 23 are injection molded by optical plastic; And two surfaces of second eyeglass 22 are aspheric surface, and it is aspheric surface that prismatic glasses 23 has a surface.

Claims

1. a digital image camera lens comprises a fixed aperture and an optical group, it is characterized in that: optical group comprises first, second and prismatic glasses, and from object space, first eyeglass is a biconvex lens, is positioned at the top of camera lens, is made by glass material; Second eyeglass is a biconcave lens; Prismatic glasses is convex lens, and its radius-of-curvature ratio towards picture side's side is big towards the radius-of-curvature of the object space side, and is positioned at the end of camera lens; Said fixed aperture is positioned at the place ahead of first eyeglass; Described second and third eyeglass is made by plastic material, and has at least a surface to be aspheric surface.