CN1704792A

CN1704792A - Image acquisition lens

Info

Publication number: CN1704792A
Application number: CN200410047388.7A
Authority: CN
Inventors: 林瑞兴; 徐清斌
Original assignee: Prodisc Technology Inc
Current assignee: Prodisc Technology Inc
Priority date: 2004-06-03
Filing date: 2004-06-03
Publication date: 2005-12-07
Anticipated expiration: 2024-06-03
Also published as: CN100354681C

Abstract

A pick-up lens includes a lens cone, a first mirror, a second mirror and a filter component, among which, the lens cone contains a first containing part and a hole, the first mirror is set at the first containing part adjacent to the hole, the second mirror is set at the first containing part keeping a distance to the first mirror, the filter component is set at the first containing part and between the two mirrors. This invented pick-up lens does not generate blackout effect when a sensor receives light rays, so clean demand can be reduced and the assembly tolerance as well.

Description

Sampling image lens

Technical field

The present invention is about a kind of sampling image lens, and especially a kind of filtering unit is arranged at the sampling image lens between first eyeglass and second eyeglass.

Background technology

Please refer to shown in Figure 1ly, is a known sampling image lens 1, comprises a lens barrel 11, one first eyeglass 12, a packing ring 13, one second eyeglass 14, a light cutoff filter eyeglass 15, a sensor 16 and a pedestal 17.

Lens barrel 11 is connected in pedestal 17, and comprises an accommodation section 111 and an aperture 112.First eyeglass 12 is arranged at accommodation section 111, and contiguous aperture 112.Packing ring 13 is arranged at accommodation section 111, and contiguous first eyeglass 12.Second eyeglass 14 is arranged at accommodation section 111 and contiguous packing ring 13.Light cutoff filter eyeglass 15 is arranged at pedestal 17, and contiguous second eyeglass 14.

Sensor 16 is arranged on the substrate 18, and substrate 18 can be a printed circuit board (PCB) or a soft board.Pedestal 17 is connected with substrate 18, and pedestal 17 sticks together and is packaged on the substrate 18.

Please refer to shown in Figure 2, because light cutoff filter eyeglass 15 is adjacent to sensor 16, therefore when light after aperture 112 enters, through first eyeglass 12, second eyeglass 14 and light cutoff filter eyeglass 15, and the fine particle of light cutoff filter eyeglass 15 (particle) can cover light, make sensor 16 upper part pixels (pixel) can produce capture-effect in the time of can't receiving light, make partly pixel light sensitivity reduction, and then the quality of influence portrait.So the cleanliness factor for light cutoff filter eyeglass 15 requires height at present, the yield on feasible the manufacturing is low and cost is high.

In order to improve yield, reduce cost at present, the manufacturer that has attempts to plate cut-off light filtering films in lens surface, but its processing procedure is difficult for.Also have manufacturer to take light cutoff filter eyeglass 15 is inserted between first eyeglasses 12 and second eyeglass 14, and with the mode of packing ring and the mutual breasting of eyeglass, but the method causes the assembling tolerance easily.And when considering to select light cutoff filter eyeglass 15 for use, the light cutoff filter eyeglass 15 of square cut easily causes four corners of filter glass to produce with the camera lens inwall when putting into circular lens barrel 11 and collides, and causes fine particle.When adopting circular light cutoff filter eyeglass 15 if avoid aforesaid shortcoming, then again because of the cutting yield of the light cutoff filter eyeglass 15 of circle far below square person, cause the more square person of its cost for high, make whole manufacturing cost also high.Light cutoff filter eyeglass 15 is arranged at the rear end of lens barrel 11 and with respect to sensor 26 and adopt, the mode of contiguous second eyeglass 14, be arranged at the mode of pedestal 17 with light cutoff filter eyeglass 15, in the same manner for the cleanliness factor of light cutoff filter eyeglass 15 ask also high, also can't deal with problems.

Because the problems referred to above, this case inventor urgently thinks a kind of requirement that can solve because of the high-cleanness, high of light cutoff filter eyeglass because of in this, and " sampling image lens " of the problem of also issuable assembling tolerance between the eyeglass etc. put into the light cutoff filter eyeglass in minimizing.

Summary of the invention

Purpose of the present invention is for providing a kind of sampling image lens, and the high-cleanness, high requirement that it can solve because of the light cutoff filter eyeglass makes the production cost of camera lens reduce.

For reaching above-mentioned purpose, comprise a lens barrel, one first eyeglass, one second eyeglass and a filtering unit according to sampling image lens of the present invention.Lens barrel has one first accommodation section and an aperture.First eyeglass is arranged at first accommodation section, and comprises first on first eyeglass of a contiguous aperture.Second eyeglass is arranged at first accommodation section, and between second eyeglass and first eyeglass distance is arranged.Filtering unit is arranged at first accommodation section and between first eyeglass and second eyeglass.

From the above, sampling image lens of the present invention is provided with a filtering unit between first eyeglass and second eyeglass, compared to the prior art, when receiving light, sensor can't produce capture-effect, therefore the requirement on cleanliness factor can reduce, and also can reduce the assembling tolerance and the yield of sampling image lens on manufacturing be improved and the cost reduction.

Description of drawings

Fig. 1 is a diagrammatic cross-section of known sampling image lens;

Fig. 2 is an optical path synoptic diagram of known sampling image lens;

Fig. 3 is the diagrammatic cross-section according to the sampling image lens of the embodiment of the invention;

Fig. 4 is the section decomposing schematic representation according to the sampling image lens of the embodiment of the invention;

Fig. 5 is another section decomposing schematic representation according to the sampling image lens of the embodiment of the invention; And

Fig. 6 is the optical path synoptic diagram according to the sampling image lens of the embodiment of the invention.

The component symbol explanation:

1 sampling image lens

11 lens barrels

111 accommodation sections

112 apertures

12 first eyeglasses

13 packing rings

14 second eyeglasses

15 light cutoff filter eyeglasses

16 sensors

17 pedestals

18 substrates

2 sampling image lens

21 lens barrels

211 first accommodation sections

212 apertures

22 first eyeglasses

First on 221 first eyeglasses

23 second eyeglasses

Second on 231 second eyeglasses

24 filtering units

241 packing rings

2,411 second accommodation sections

242 filter plates

25 pedestals

26 sensors

27 substrates

28 prismatic glasseses

Embodiment

Following with reference to the sampling image lens of relevant drawings explanation according to the embodiment of the invention, wherein components identical will be illustrated with identical reference marks.

Please refer to Fig. 3 and shown in Figure 4, comprise a lens barrel 21, one first eyeglass 22, one second eyeglass 23, a filtering unit 24 and a pedestal 25 according to the sampling image lens 2 of the embodiment of the invention.Lens barrel 21 comprises one first accommodation section 211 and an aperture 212, and is connected in pedestal 25.Pedestal 25 is connected with a substrate 27, and pedestal 25 sticks together and is packaged on the substrate 27.Substrate 27 can be a printed circuit board (PCB) or is a soft board.In the embodiment of the invention, pedestal 25 with the ultraviolet light gluing and is packaged on the substrate 27, and other method that pedestal 25 is sticked together be packaged on the substrate 27 all is included in the patent category of the present invention.

First eyeglass 22 is arranged at first accommodation section 211, comprises first 221 on one first eyeglass.First 221 on first eyeglass is the face of a contiguous aperture 212, and is a convex surface.First eyeglass 22 can be a glass mirror or is a glass lens, and in the embodiment of the invention, first eyeglass 22 is a glass lens, and is an aspherical lens.

Second eyeglass 23 is arranged at first accommodation section 211, and between first eyeglass 22 distance is arranged.Second eyeglass 23 can be a glass mirror or is a glass lens, and in the embodiment of the invention, second eyeglass 23 is a glass lens, and is an aspherical lens.Second eyeglass 23 has one second eyeglass second 231, and second 231 on second eyeglass is an inverse surface with respect to the face that is close to filtering unit 24.

Filtering unit 24 is arranged at first accommodation section 211, between first eyeglass 22 and second eyeglass 23.The thickness of filtering unit 24 can equate with the distance of first eyeglass 22 with 23 on second eyeglass.Filtering unit 24 comprises a packing ring (spacer) 241 and a filter plate 242.

Packing ring 241 is in order to isolate parasitic light and to have one second accommodation section 2411.In the embodiment of the invention, packing ring 241 is a ring-shaped plastics thing, and other can all be included in the patent category of the present invention in order to the unlike material of isolation parasitic light and the packing ring of shape.

Filter plate 242 is arranged at second accommodation section 2411, in order to filter unwanted high frequency spectrum and low frequency spectrum light wave.Filter plate 242 can be an infrared ray cut optical filtering (Infrared Rays Filter, IR Filter), a ultraviolet light optical filtering (Ultraviolet Filter, UV filter), an absorption optical filter (Absorbing Filter) or be a low pass filters (Low Pass Filter, LPF), filter plate 242 is an infrared ray cut optical filtering in the embodiment of the invention.

Sampling image lens 2 can more comprise a sensor 26 that is arranged on the substrate 27.In the embodiment of the invention, sensor 26 can be a complementary matal-oxide semiconductor sensor (complementary metal oxide semiconductor sensor, CMOS sensor).

Please refer to shown in Figure 5ly, sampling image lens 2 can more comprise a prismatic glasses 28.Prismatic glasses 28 is arranged at first accommodation section 211, and between the aperture 212 and first eyeglass 22, to promote image quality.

Please refer to Fig. 3 and shown in Figure 6, because sampling image lens 2 of the present invention comprises a filtering unit 24 that is arranged at 23 on first eyeglass 22 and second eyeglass, and filtering unit 24 comprises a filter plate 242, therefore when light after aperture 212 enters, through first eyeglass 22, the filter plate 242 and second eyeglass 23, the scope of its imaging can be amplified, thereby the distance between the impurity of filter plate 242 also is exaggerated, sensor 26 received imagings then greatly reduce because of the capture-effect that impurity caused on the filter plate 242, so, requirement for the cleanliness factor of filter plate 242 can reduce, and makes that producing yield increases, and production cost reduces.In addition, owing among the present invention filter plate 242 and packing ring 241 are combined as same assembly, therefore more easy in the assembling of sampling image lens 2, the assembling tolerance of minimizing sampling image lens 2 makes production capacity improve, and production cost reduces.

The above only is an illustrative, but not is restricted person.Anyly do not break away from spirit of the present invention and category, and, all should be contained in the described claim its equivalent modifications of carrying out or change.

Claims

1. a sampling image lens is characterized in that, this sampling image lens comprises:

One lens barrel, it has one first accommodation section and an aperture;

One first eyeglass, it is arranged at this first accommodation section, and contiguous this aperture;

One second eyeglass, it is arranged at this first accommodation section, and between this second eyeglass and this first eyeglass distance is arranged; And

One filtering unit, it is arranged at this first accommodation section, between this first eyeglass and this second eyeglass.

2. sampling image lens as claimed in claim 1, wherein this filtering unit comprises a packing ring and a filter plate.

3. sampling image lens as claimed in claim 2, wherein this filter plate is an infrared ray cut filter glass.

4. sampling image lens as claimed in claim 2, wherein this packing ring has one second accommodation section, and this filter plate is arranged at this second accommodation section.

5. sampling image lens as claimed in claim 1, wherein this first eyeglass and this second eyeglass are respectively an aspherical lens.

6. sampling image lens as claimed in claim 1, wherein this first eyeglass and this second eyeglass are respectively a glass lens.

7. sampling image lens as claimed in claim 1, wherein this first eyeglass comprises the convex surface of contiguous this camera aperture.

8. sampling image lens as claimed in claim 1, wherein this second eyeglass comprises an inverse surface with respect to contiguous this filtering unit face.

9. sampling image lens as claimed in claim 1, wherein the thickness of this filtering unit equates with distance between this second eyeglass with this first eyeglass approximately.

10. sampling image lens as claimed in claim 1 more comprises a pedestal, and this lens barrel is connected in this pedestal.

11. sampling image lens as claimed in claim 1 wherein more comprises a prismatic glasses, this prismatic glasses is arranged at this first accommodation section, and between this aperture and this first eyeglass.