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CN-116300288-B - Projection ray apparatus and projection equipment

CN116300288BCN 116300288 BCN116300288 BCN 116300288BCN-116300288-B

Abstract

The application relates to a projection optical machine and projection equipment. The projection optical machine comprises a light source, a light cone, a collimating lens, a focusing lens and a lens, wherein the light cone, the collimating lens, the focusing lens and the lens are sequentially arranged along the propagation path of emergent light of the light source, the light cone is used for collecting the emergent light of the light source and emergent light from a light outlet, the collimating lens is used for collimating the light, the focusing lens is used for converging the light towards the lens and the lens is used for projecting the light, the projection optical machine meets the conditions that [ |ra2|, |rb2|max is not more than D/2, rb2 is the distance between an incident point of the light directly emergent at the edge of the light outlet on the lens and an optical axis, rb2 is the distance between the incident point on the lens and the optical axis, and D is the effective aperture of the lens. The projection light machine has the advantages of small light loss and high light utilization rate, and is favorable for improving projection brightness.

Inventors

  • WANG CHENGWEI

Assignees

  • 峰米(重庆)创新科技有限公司

Dates

Publication Date
20260512
Application Date
20230329

Claims (10)

  1. 1. The projection light machine is characterized by comprising a light source, and a light cone, a collimating lens, a focusing lens and a lens which are sequentially arranged along the propagation path of emergent light of the light source; The two ends of the light cone are respectively provided with a light inlet and a light outlet, the light cone is used for receiving emergent light of the light source through the light inlet and emergent light from the light outlet, the collimating lens is used for collimating the light, the focusing lens is used for converging the light towards the lens, and the lens is used for projecting the light; the light cone is provided with a first reflecting surface and a second reflecting surface which are oppositely arranged, and the distance between the first reflecting surface and the second reflecting surface is gradually increased in the direction from the light inlet to the light outlet along the optical axis; the projection optical machine meets the following conditional expression: [|ra2|,|rb2|]max≤D/2; ; Wherein ra2 is the distance between the incident point of the light directly emitted at the edge of the light outlet on the lens and the optical axis, rb2 is the light reflected at the edge of the light outlet and emitted from the light cone, D is the effective aperture of the lens, r is the distance between the edge of the light outlet of the light cone and the optical axis, D1 is the distance between the collimating lens and the focusing lens on the optical axis, D2 is the distance between the focusing lens and the lens on the optical axis, α is the included angle between the first reflective surface and the second reflective surface, θ is the included angle between the light directly emitted at the edge of the light outlet and the optical axis, f1 is the focal length of the collimating lens, and f2 is the focal length of the focusing lens.
  2. 2. The projection light engine of claim 1, wherein the projection light engine satisfies the following condition: 。
  3. 3. The projection light engine of claim 1, wherein the light emitting surface of the light source is substantially rectangular in shape, the light entrance and the light exit of the light cone are substantially rectangular in shape, the cross-section of the light cone is substantially rectangular in shape, and the cross-section of the light cone increases in area in a direction along the optical axis from the light entrance toward the light exit.
  4. 4. A projection light engine as claimed in claim 3, characterized in that the light emitting surface of the light source has a length of more than or equal to 12.5mm and less than or equal to 14mm and a width of more than or equal to 6mm and less than or equal to 7.2mm.
  5. 5. The projector according to claim 3, wherein the length of the light inlet is greater than or equal to 12.7mm and less than or equal to 14.5mm, the width is greater than or equal to 6.2mm and less than or equal to 7.7mm, the length of the light outlet is greater than or equal to 92mm and less than or equal to 100mm, the width is greater than or equal to 54mm and less than or equal to 60mm, and the distance between the light inlet and the light outlet on the optical axis is greater than or equal to 55mm and less than or equal to 60mm.
  6. 6. The projection light engine of claim 1, wherein, The focal length of the collimating lens is greater than or equal to 70mm and less than or equal to 85mm, and/or, The focal length of the focusing lens is greater than or equal to 110mm and less than or equal to 125mm, and/or, The distance between the light outlet and the collimating lens on the optical axis is less than or equal to 0.6mm, and/or, The distance between the collimating lens and the focusing lens on the optical axis is greater than or equal to 18mm and less than or equal to 20mm.
  7. 7. The projection light engine of claim 1 further comprising a polarizer disposed between the collimating lens and the focusing lens, the polarizer configured to convert light into polarized light.
  8. 8. The projection light engine of claim 1, wherein the light source comprises a light emitting diode made from a eutectic process.
  9. 9. The projection light engine of claim 1, wherein the light source has a power density greater than or equal to 0.82W/mm 2 and less than or equal to 1.1W/mm 2 .
  10. 10. A projection device, characterized in that the projection device comprises a projection light engine as claimed in any one of claims 1-9.

Description

Projection ray apparatus and projection equipment Technical Field The present application relates to the field of projection devices, and in particular, to a projection light machine and a projection device. Background LCD projectors typically include an illumination system, an LCD display system, and an imaging system, with the LCD projector imaging pictures displayed on the LCD through a lens onto a screen based on kohler illumination. The LCD projector has low cost and simple manufacture compared with other projectors, such as DLP projector, LCoS projector, etc. However, the conventional LCD projector has a serious problem of light loss, which easily causes a decrease in projection brightness, and affects viewing experience. Disclosure of Invention Based on this, it is necessary to provide a projection light machine and a projection device for solving the problem of serious light loss of the conventional LCD projector. The projection optical machine comprises a light source, and a light cone, a collimating lens, a focusing lens and a lens which are sequentially arranged along the propagation path of emergent light of the light source; The two ends of the light cone are respectively provided with a light inlet and a light outlet, the light cone is used for receiving emergent light of the light source through the light inlet and emergent light from the light outlet, the collimating lens is used for collimating the light, the focusing lens is used for converging the light towards the lens, and the lens is used for projecting the light; The projection optical machine meets the condition that [ |ra2|, |rb2| ] max is less than or equal to D/2; Wherein ra2 is the distance between the incident point of the light directly emitted from the edge of the light outlet on the lens and the optical axis, rb2 is the light reflected from the edge of the light outlet and emitted from the light cone, and D is the effective aperture of the lens. Above-mentioned projection ray apparatus, the bore of the emergent light beam of light source can effectively be compressed in the collection effect of light cone, the collimation effect of collimating lens and the focusing effect of focusing lens to effectively reduce the light height of incident lens, cooperation ra2 and rb2 are less than or equal to the design of D/2, can make the light height of incident lens all be in the effective aperture scope of camera lens, are favorable to reducing the loss of light, promote the utilization ratio of light, thereby promote projection luminance. Meanwhile, the light height of the incident lens is reduced, and the effective caliber of the lens is reduced, so that the occupied space and the manufacturing cost of the lens are reduced, and the overall size of the projection optical machine is reduced. In one embodiment, the light cone has a first reflecting surface and a second reflecting surface which are disposed opposite to each other, and a distance between the first reflecting surface and the second reflecting surface gradually increases in a direction along the optical axis from the light inlet to the light outlet. In one embodiment, the projection light engine satisfies the following condition: Wherein r is the distance between the edge of the light outlet of the light cone and the optical axis, d1 is the distance between the collimating lens and the focusing lens on the optical axis, d2 is the distance between the focusing lens and the lens on the optical axis, alpha is the included angle between the first reflecting surface and the second reflecting surface, theta is the included angle between the light directly emitted from the edge of the light outlet and the optical axis, f1 is the focal length of the collimating lens, and f2 is the focal length of the focusing lens. In one embodiment, the projection light engine satisfies the following condition: Wherein r is the distance between the edge of the light outlet of the light cone and the optical axis, d1 is the distance between the collimating lens and the focusing lens on the optical axis, d2 is the distance between the focusing lens and the lens on the optical axis, alpha is the included angle between the first reflecting surface and the second reflecting surface, theta is the included angle between the light directly emitted from the edge of the light outlet and the optical axis, f1 is the focal length of the collimating lens, and f2 is the focal length of the focusing lens. In one embodiment, the light emitting surface of the light source is substantially rectangular in shape, the light inlet and the light outlet of the light cone are substantially rectangular in shape, the cross section of the light cone is substantially rectangular in shape, and the area of the cross section of the light cone gradually increases in a direction along the optical axis from the light inlet to the light outlet. In one of the embodiments of the present invention, The light emitting surface of the light