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Lens of projector

A projector and lens technology, applied in the field of projector lens, can solve the problems of focus shift, lens shift, poor projector convenience, etc.

Inactive Publication Date: 2012-11-28
ASIA OPTICAL CO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, during the use of the projector, these spacer rings will be heated by the waste heat generated by the internal light source of the projector and gradually expand, which will cause the lens inside the projector lens to shift and cause focus shifting.
In other words, after the projector has been used for a period of time, the image formed on the imaging surface (such as a screen, curtain or wall) will gradually become blurred due to the lens shifting. At this time, it must be refocused to obtain a clear image. Not only causes poor convenience of the projector, but also affects people's mood when using the projector

Method used

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Embodiment Construction

[0012] In order to illustrate the present invention more clearly, preferred embodiments are given and described in detail with accompanying drawings as follows.

[0013] see figure 1 , The projector lens 1 of the preferred embodiment of the present invention includes a lens barrel 10, five lenses 21-25 and four spacer rings 31-34. The five lenses 21 - 25 are arranged in the lens barrel 10 and are sequentially divided into a first lens 21 , a second lens 22 , a third lens 23 , a fourth lens 24 and a fifth lens 25 . The fourth spacer rings 31-34 are respectively the first spacer ring 31, the second spacer ring 32, the third spacer ring 33 and the fourth spacer ring 34, wherein the first spacer ring 31 is located between the first lens 21 and the fourth spacer ring 34. Between the second lens 22; the second spacer ring 32 is located between the second lens 22 and the third lens 23; the third spacer ring 33 is located between the third lens 23 and the fourth lens 24; The fourth ...

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Abstract

The invention relates to a lens of a projector, comprising at least three lenses and at least two spacer rings. The two spacer rings are used for spacing the three lenses at a first interval at a first working temperature and spacing the three lenses at a second interval at a second working temperature; and the three lenses form a first image plane in the first interval and form a second plane in the second interval, and the first image plane and the second image plane are arranged in the same imaging plane.

Description

technical field [0001] The present invention relates to a projector, and more specifically refers to a projector lens. Background technique [0002] In recent years, with the advancement of imaging technology, more and more people use projectors for presentations, video conferences, meetings or watching videos. In order to enable people to easily carry projectors to different places (such as living rooms, meeting rooms or Classrooms), the size and weight of the projector are becoming lighter and lighter, and in order to avoid the lens in the projector lens from being displaced due to vibration when the user moves the projector, a plurality of A spacer ring made of the same material is distributed between each lens so as to fix the lens at a preset position. [0003] However, during the use of the projector, these spacer rings will be heated by the waste heat generated by the internal light source of the projector and gradually expand, which will cause the lens inside the pr...

Claims

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Application Information

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IPC IPC(8): G02B7/02G02B7/00G03B21/14
Inventor 孙嘉鸿
Owner ASIA OPTICAL CO INC