Lens used for short-focus projection machine

A projector and short focal length technology, applied in optics, instruments, projection devices, etc., can solve the problems of high cost, poor system accuracy, and difficulty in ensuring the accuracy of lens parts, achieving simple structure, improving assembly accuracy, and reducing the number of parts. Effect

Pending Publication Date: 2018-09-07
UNION OPTECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, according to the current level of processing technology, it is very difficult to guaran...

Method used

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  • Lens used for short-focus projection machine
  • Lens used for short-focus projection machine

Examples

Experimental program
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Embodiment Construction

[0014] A lens for a short-focus projector, comprising a base body 1, a lens assembly 2, a mirror 3 (the mirror 3 adopts an aspheric mirror), a focus adjustment device 4 and a rear focus adjustment device 5, the base body 1 An accommodating cavity 11 is provided on the top, and the lens assembly 2 is arranged in the accommodating cavity 11. The front end and the rear end of the accommodating cavity 11 opposite to the lens assembly 2 are respectively provided with a front light hole 12 and a rear light hole 13, and the reflector 3 is arranged in the On the rear light hole 13, the focus and focus device 4 and the rear focus and focus device 5 are respectively arranged on the left and right sides of the base body 1, and the middle part of the reflector 3 is fixed on the base body 1 by two locking screws 6, and the reflector The lower side of 3 is connected with the seat body 1 by two adjustable screws 7, and each adjustable screw 7 is provided with an adjustment spring 8.

[0015]...

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PUM

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Abstract

The invention provides a lens used for a short-focus projection machine. The lens comprises a base, a lens assembly, a reflector, a focusing device and a back focus focusing device, wherein an accommodating cavity is arranged on the base; the lens assembly is arranged inside the accommodating cavity; a front light through hole and a rear light through hole are formed in the front end and the rearend, opposite to the lens, of the accommodating cavity respectively; the reflector is arranged on the rear light through hole; the focusing device and the back focus focusing device are arranged on the left side and the right side of the base respectively; the middle part of the reflector is fixed on the base through two lock screws; and the lower side of the reflector is connected with the base through two adjustable screws. The lens is simple in structure, and the reflector is integrated onto the base, so that the quantity of components of an adjusting structure of the reflector is reduced,and then the assembling accuracy is improved; moreover, the reflector is positioned by adopting a four-point connection method and is positioned by using two points, and the other two points are movably adjusted, so that the degree of freedom of the reflector is reduced, and the adjusting accuracy is greatly reduced.

Description

【Technical field】 [0001] The invention relates to the field of optical equipment, in particular to a lens for a short focal length projector. 【Background technique】 [0002] As projectors are more and more widely used in commercial and household applications, consumers have higher and higher requirements for projectors, not only requiring good picture effects, but also requiring large projection screen size and short projection distance. Small footprint. As the core component of the projector, the optical lens, including the short focal length projector lens, can make the projector meet the above requirements. [0003] For the short-focus projector lens, the adjustment and fixing structure of the reflector, the connection structure between the reflector and the lens, and the connection structure between the lens and the projector lighting part are very important. As the market has higher and higher requirements for the resolution of the projection lens, the size of the pro...

Claims

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Application Information

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IPC IPC(8): G03B21/14
CPCG03B21/142
Inventor 李中杰邱盛平黄浩
Owner UNION OPTECH
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