CN102419472A

CN102419472A - Short-focus lens

Info

Publication number: CN102419472A
Application number: CN2010102925136A
Authority: CN
Inventors: 赵文龙
Original assignee: Nanjing Magon Opto-electrical Science and Technology Co Ltd
Current assignee: Nanjing Magon Opto-electrical Science and Technology Co Ltd
Priority date: 2010-09-27
Filing date: 2010-09-27
Publication date: 2012-04-18

Abstract

The invention relates to the technical field of optoelectronic display, and mainly relates to a short-focus lens used on an interactive type electronic whiteboard system. The invention aims to provide the short-focus lens which is matched with a COMS (Complementary Metal Oxide Semiconductor) chip circuit system with the size of one quarter inch, so that the short-focus lens can shoot image information on positive projection carriers, such as whiteboards, projecting screens, flat-panel televisions, plasma and liquid crystal display televisions and the like, and a common wall, thereby an interactive type electronic whiteboard with larger size, larger application range and better convenience can be realized.

Description

A kind of short-focus lens

Technical field

The present invention relates to the photoelectric display technical field, what relate generally to is the short-focus lens that uses on a kind of interactive electric whiteboard system.

Background technology

Existing common interactive electric whiteboard system is a multifunctional write plateform system that integrates digital rear-projection, interactive electric whiteboard, computer; This plateform system volume is big, and cost is high, and screen-sized is restricted; Whole system uses more fixing, and maneuverability is not strong.Compared with prior art; This blank technology is used the unique low beam receiving system in the world of original creation, can perfect compatible blank, projection screen, flat panel TV, plasma and LCD TV etc. are just throwing carrier, even comprising common wall; Attainable interaction function is just the same; Its dirigibility can let user oneself adjust, and carries out larger sized upgrading easily, has satisfied user's application need greatly; Applied widely, broken through existing common interactive electric whiteboard system technology limitation.An and short focal length camera module group lens of the present invention core component on this interactive electric whiteboard system just.

Summary of the invention

The purpose of this invention is to provide a kind of short-focus lens; " the CMOS system use that matches; make it can absorb blank, projection screen, flat panel TV, plasma and LCD TV etc. and just throwing the image information on carrier and the common wall realizes more large scale, bigger range of application, interactive electric whiteboard more easily with 1/4.

For realizing above-mentioned purpose, the technical scheme that the present invention takes is: this short-focus lens adopts the combination of 6 groups of 6 lens, and wherein second is the plastic aspherical element lens.Light sends through system by the right 1/4 from object space, and " CMOS (7) chip receives.

Be followed successively by single negative lens, single negative lens, single-positive-lens, single-positive-lens, single-positive-lens, infrared filter, 1/4 " CMOS chip to picture side from object space.

The short focal length camera module group lens that is designed to according to such scheme; Focal distance f '=1.34mm, the visual field departs from 163%, optical distortion＜10%; Margin and center illumination is than >=1: 5; The CMOS chip size is 1/4 ", when the benchmark projector distance was 500mm, images acquired was of a size of 60 "; Through the adjustment projector distance; Can absorb blank, projection screen, flat panel TV, plasma and LCD TV etc. and just throw the image information on carrier and the common wall, realize more large scale, bigger range of application, interactive electric whiteboard more easily, the user does not need extra increase cost just can carry out larger sized upgrading (plate face enlarge back only need adjust the distance of short focal length camera module group lens and blank a little get final product) easily.

Description of drawings

Figure one is an optical system diagram of the present invention.

Figure two is structural drawing of the present invention.

Label among the figure, the 1st, single negative lens, the 2nd, single negative lens, the 3rd, single-positive-lens, the 4th, single-positive-lens, the 5th, single-positive-lens, the 6th, infrared filter, 7 is 1/4 " CMOS chip, the 8th, flange, the 9th, main body.

Embodiment

Short-focus lens of the present invention; Have body shell, objective lens, flange; The wherein combination of body shell internal fixation object lens lens is arranged in order to picture side by object space respectively and becomes to have single negative lens, single negative lens, single-positive-lens, single-positive-lens, single-positive-lens, infrared filter, the 1/4 " assembly of CMOS chip.This short-focus lens all uses environmental protection glass material commonly used, and wherein sequence number 2 is the plastic aspherical element lens, and second is aspheric surface, mainly is the distortion for corrective system." CMOS chip (7) is connected the back through screw and forms this short focus mirror head system through being threaded with main body (9) flange (8) and 1/4; wherein flange (8) can be adjusted total system because the CMOS image planes displacement error that the part manufacturing brings with main body (9) through being threaded; when projector distance changes, play system's focusing action in addition, the assurance system is pickup image information accurately.

Short-focus lens of the present invention the performance parameter that will reach be: focal distance f '=1.34mm; The visual field departs from 163%, optical distortion＜10%, and margin and center illumination is than >=1: 5; The CMOS chip size is 1/4 "; its field of view angle is 142 °, and when the benchmark projector distance was 500mm, images acquired was of a size of 60 ".

For satisfying the requirement of above-mentioned performance parameter, through embodiment the structural parameters of each lens in the short-focus lens optical system are done further to describe below.

In figure one, from left to right: the radius R 1=25.509mm of single negative lens (1), R2=8.075mm, thickness d=4.39mm, airspace d=4.02mm.

First of single negative lens (2) is sphere, radius R 1=13.02mm, and second is plastics idol time aspheric surface, its radius R 2=2.9mm; Asphericity coefficient K=-1.04, A4=-0.00066, A6=-4.172E-005; A8=5.1E-007, thickness d=1.1mm, airspace d=8.48mm.

The radius R 1=2.679mm of single-positive-lens (3), R2=3.394mm, thickness d=2.01mm, airspace d=1mm.

The radius R 1=-5.74mm of single-positive-lens (4), R2=-2.885mm, thickness d=1.75mm, airspace d=0.15mm.

The radius R 1=12.706mm of single negative lens (5), R2=-12.706mm, thickness d=1.44mm, airspace d=0.15mm.

Thickness d=the 0.7mm of infrared filtering (6), airspace d=1.28mm.

CMOS chip (7) size 1/4 ", length breadth ratio is 4: 3, compatible 16: 9.

Claims

1. short-focus lens; Be followed successively by single negative lens (1), single negative lens (2), single-positive-lens (3), single-positive-lens (4), single-positive-lens (5), infrared filter (6) to picture side from object space, it is characterized in that this camera lens the performance parameter that will reach be: focal distance f '=1.34mm, the visual field departs from 163%; Optical distortion＜10%; Margin and center illumination is than >=1: 5, and the CMOS/CCD chip size is 1/4 ", its field of view angle is 142 °; when the benchmark projector distance is 500mm, images acquired is of a size of 60 ".

2. a kind of short-focus lens as claimed in claim 1 is characterized in that: the radius R 1=25.509mm of described single negative lens (1), R2=8.075mm, thickness d=4.39mm, airspace d=4.02mm.

3. a kind of short-focus lens as claimed in claim 1 is characterized in that: first of described single negative lens (2) is sphere, radius R 1=13.02mm; Second is plastics idol time aspheric surface, its radius R 2=2.9mm, asphericity coefficient K=-1.04; A4=-0.00066, A6=-4.172E-005, A8=5.1E-007; Thickness d=1.1mm, airspace d=8.48mm.

4. a kind of short-focus lens as claimed in claim 1 is characterized in that: the radius R 1=2.679mm of described single-positive-lens (3), R2=3.394mm, thickness d=2.01mm, airspace d=1mm.

5. a kind of short-focus lens as claimed in claim 1 is characterized in that: the radius R 1=-5.74mm of described single-positive-lens (4), R2=-2.885mm, thickness d=1.75mm, airspace d=0.15mm.

6. a kind of short-focus lens as claimed in claim 1 is characterized in that: the radius R 1=12.706mm of described single negative lens (5), R2=-12.706mm, thickness d=1.44mm, airspace d=0.15mm.

7. a kind of short-focus lens as claimed in claim 1 is characterized in that: the thickness d=0.7mm of described infrared filter (6), airspace d=1.28mm.

8. a kind of short-focus lens as claimed in claim 1 is characterized in that: described CMOS/CCD chip (7) size 1/4 ", length breadth ratio is 4: 3, compatible 16: 9.