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Projection device and zoom lens thereof

A zoom lens and mirror frame technology, which is applied in the field of projection display, can solve the problems of bulky, easy motor stalling, and complex structure, and achieve the effects of shortening the transmission path, improving compactness, and reducing the number of parts

Pending Publication Date: 2020-01-10
QINGDAO HISENSE LASER DISPLAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a projection device and its zoom lens to at least partly solve the problems of bulky size, complex structure and easy motor stalling of existing zoom projection devices or other potential technical problems

Method used

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  • Projection device and zoom lens thereof
  • Projection device and zoom lens thereof
  • Projection device and zoom lens thereof

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Embodiment Construction

[0037] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0038] In describing the present invention, it should be understood that the terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", " The orientation or positional relationship indicated by "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" etc. is based on the orientation or positional relationship shown in the drawings, It is only for the convenience of describing the present invention and simplifying the description, but does not indicate or imply that the...

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PUM

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Abstract

The invention provides a projection device and a zoom lens thereof. The zoom lens comprises: a lens cone, a lens frame on which a lens is installed, a driving motor, a transmission mechanism and a guide mechanism; the lens frame can move along a light transmission path under the driving of the driving motor and the transmission mechanism and under the guide of the guide mechanism; and moreover, afirst gear and a second gear in the transmission mechanism can be engaged with or disengaged from each other. The projection device comprises a shell, a light source disposed in the shell, and the above zoom lens disposed on a transmission path of light emitted from the light source. The projection device and the zoom lens thereof provided the invention are beneficial to miniaturization and weight reduction, and can reduce the stalling risk of the driving motor.

Description

technical field [0001] The invention relates to the field of projection display, in particular to a projection device and a zoom lens thereof. Background technique [0002] A projection device is a device capable of projecting images on a screen, and is generally used in commercial or living fields. For example, some families now use home projectors instead of traditional televisions to watch images and videos. [0003] In existing projection devices, the phenomenon that the projected picture becomes blurred often occurs. For example, when the projection device is used for a period of time, the internal lens will change in shape or move due to thermal expansion and contraction, which will cause optical distortion and analytical variation, making the projected picture blurred. You need to refocus. As another example, when using a projection device in a mobile scene, it needs to be refocused every time it is used, so that the picture projected from the projection device ont...

Claims

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Application Information

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IPC IPC(8): G02B7/09G03B21/14
CPCG02B7/09G03B21/142
Inventor 陈友才杨长明李建军
Owner QINGDAO HISENSE LASER DISPLAY CO LTD