Projector optical device of multi-material light cone

Abstract

The utility model provides a projector optical device of a multi-material light cone, which relates to the technical field of photoelectric equipment manufacturing and comprises an LED, a light cone, a collimating mirror, heat insulation glass, an LCD screen, a field lens and a lens. The LED, the light cone, the collimating mirror, the heat insulation glass, the LCD screen and the field lens are sequentially arranged along a light path; comprising at least two different reflection spectra; the light cone is composed of at least two reflection surfaces with different reflection spectrums, and the reflection surfaces can be bonded and fixed reflection film layers and can also be sprayed or chemically plated reflection coatings to control the spectrums after light reflection. The higher the temperature is, the higher the light transmittance of the LCD screen to the short wavelength is, so that the difference of the surface temperature of the LCD screen causes the difference of the color and the brightness of the projected picture. The light transmittance of the LCD screen corresponding to the entrance is improved by improving the reflective rate of the reflective surface corresponding to the entrance to the short wavelength, so that the light transmittance of the whole LCD screen is balanced, and a uniform picture is obtained.

Description

Technical Field

[0001] The utility model relates to the technical field of optoelectronic equipment manufacturing, in particular to a projector optical device with a multi-material light cone. Background Art

[0002] Currently in the market, the light cones of LCD projectors are all composed of the same reflective surface. When light is refracted by the LCD, part of the energy will be absorbed by the LCD, resulting in a high temperature of the LCD, which needs to be dissipated to keep it within the operating temperature range. When the heat dissipation fluid dissipates heat for the LCD, the temperature at the outlet includes the temperature of the entire LCD, so it is higher than the temperature at the inlet, which causes the temperature of the LCD to be different. The higher the temperature, the higher the transmittance of the LCD to short wavelengths, so the difference in surface temperature will cause the color and brightness of the projected picture to be different. Therefore, a new solution is urgently needed in the prior art to solve the above problems. Utility Model Content

[0003] The problem to be solved by the utility model is: how to solve the problem of uneven illumination and color of the picture caused by the temperature difference on the LCD screen.

[0004] The utility model provides a projector optical device with a multi-material light cone, comprising: an LED, a light cone, a collimating mirror, a heat-insulating glass, an LCD screen, a field mirror and a lens;

[0005] LED, light cone, collimator, heat-insulating glass, LCD screen and field lens are arranged in sequence along the optical path;

[0006] The LED is used as a light source to emit light;

[0007] The light cone is in the shape of a rhombus and includes at least two reflective surfaces with different reflective spectra;

[0008] After being reflected by the reflective surface, the light enters the lens through the collimator, the heat-insulating glass, the LCD screen and the field lens in sequence;

[0009] A heat dissipation channel is formed between the LCD screen and the heat-insulating glass, wherein the heat dissipation channel includes an inlet and an outlet, and the heat dissipation fluid enters the heat dissipation channel from the inlet and is discharged from the heat dissipation channel through the outlet;

[0010] The reflectivity of the reflective surface corresponding to the entrance port to short wavelengths is higher than the reflectivity of the reflective surface corresponding to the exit port.

[0011] The reflective surface is a reflective film layer bonded to the light cone.

[0012] The reflective surface is a reflective coating disposed on the light cone by spraying or chemical plating.

[0013] The collimating mirror is a Fresnel mirror.

[0014] The field lens is a Fresnel lens.

[0015] The large-angle light emitted by the LED is transformed into small-angle light through the light cone and is incident on the collimator.

[0016] A reflecting mirror is also included, and the reflecting mirror reflects the light passing through the field lens into the lens.

[0017] The reflectivity of the reflective surface corresponding to the outlet for long wavelengths is higher than the reflectivity of the reflective surface corresponding to the inlet.

[0018] The beneficial effect of the present application is that the light cone is composed of at least two or more reflective surfaces with different reflective spectra, and the reflective surface can be a reflective film layer fixed by bonding, or a reflective coating sprayed or chemically plated to control the spectrum of light after reflection. Because the higher the temperature, the higher the transmittance of the LCD screen to short wavelengths, the difference in the surface temperature of the LCD screen will cause the color and brightness of the projected picture to be different. The present application improves the transmittance of the LCD screen corresponding to the entrance by increasing the reflectivity of the reflective surface corresponding to the entrance to short wavelengths, thereby balancing the transmittance of the entire LCD screen and obtaining a uniform picture. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of Example 1 of a projector optical device with a multi-material light cone according to the utility model.

[0020] Figure 2 The utility model is a side view of a heat dissipation channel of a projector optical device with a multi-material light cone.

[0021] Figure 3 The utility model is a schematic diagram of a light cone of a projector optical device with a multi-material light cone.

[0022] Figure 4 It is a structural schematic diagram of Example 2 of a projector optical device with a multi-material light cone according to the utility model. DETAILED DESCRIPTION

[0023] In view of the shortcomings of the above-mentioned existing measurement technology, the utility model proposes a projector optical device of multi-material light cone, such as Figure 1-Figure 4 As shown, it includes: LED 1, light cone 2, collimator 3, heat-insulating glass 4, LCD screen 5, field lens 6 and lens 8;

[0024] LED 1, light cone 2, collimator 3, heat-insulating glass 4, LCD screen 5 and field lens 6 are arranged in sequence along the optical path;

[0025] The LED 1 is used as a light source to emit light;

[0026] The light cone 2 is in the shape of a rhombus, and includes at least two reflective surfaces with different reflective spectra;

[0027] After being reflected by the reflective surface, the light passes through the collimator 3, the heat-insulating glass 4, the LCD screen 5 and the field lens 6 in sequence and enters the lens 8;

[0028] A heat dissipation channel 10 is formed between the LCD screen 5 and the heat-insulating glass 4. The heat dissipation channel 10 includes an inlet 11 and an outlet 12. The heat dissipation fluid enters the heat dissipation channel 10 from the inlet 11 and is discharged from the heat dissipation channel 10 through the outlet 12.

[0029] The reflectivity of the reflective surface corresponding to the entrance 11 to short wavelengths is higher than the reflectivity of the reflective surface corresponding to the exit 12 .

[0030] The reflective surface 21 is a reflective film layer bonded to the light cone 2 .

[0031] The reflective surface 21 is a reflective coating disposed on the light cone 2 by spraying or chemical plating.

[0032] The collimating mirror 3 is a Fresnel mirror.

[0033] The field lens 6 is a Fresnel lens.

[0034] The large-angle light emitted by the LED 1 is transformed into small-angle light through the light cone 2 and is incident on the collimator 3 .

[0035] The optical system further comprises a reflective mirror 7 , which reflects the light passing through the field lens 6 into the lens 8 .

[0036] The reflectivity of the reflective surface corresponding to the outlet 12 to long wavelengths is higher than the reflectivity of the reflective surface corresponding to the inlet 11 .

[0037] In a specific embodiment, the light cone 2 is a four-sided rhombus, the surface material of the reflection surface of the light cone 2 corresponding to the outlet 12 is Alonad's miro 4400AG, and the surface materials of the other three reflection surfaces are all Alonad's miro 4200AG.

[0038] Because the higher the temperature, the higher the transmittance of the LCD screen 5 to short wavelengths, the difference in surface temperature will lead to differences in the color and brightness of the projected image. The present application improves the transmittance of the LCD screen 5 corresponding to the entrance 11 by increasing the reflectivity of the reflective surface corresponding to the entrance 11 to short wavelengths, thereby balancing the transmittance of the entire LCD screen 5 and obtaining a uniform image.

[0039] Example 1

[0040] In this embodiment, the heat dissipation fluid is air, and its movement direction is as follows: Figure 1 and Figure 2 As shown by the middle arrow, it moves from bottom to top. LED1, as a light source, emits light 100; light cone 2 reflects the large-angle light emitted by LED1 into small-angle light and enters collimator 3 to improve the collimation efficiency. Since the direction of the heat dissipation fluid is from bottom to top, it can be seen from the propagation process of the upper light 100 that the high-temperature position of LCD screen 5 corresponds to the reflection surface on the upper side of light cone 2, so the reflectivity of the reflection surface below light cone 2 to the short wavelength of light 100 is increased to compensate for the color unevenness and brightness uniformity affected by high temperature. Collimator 3 uses Fresnel mirror to collimate light 100 coming out of light cone 3. Insulating glass 4 shares part of the energy of LCD screen 5 to improve heat dissipation efficiency; LCD screen 5 is a display screen; field lens 6 uses Fresnel mirror to focus the collimated light 100 to improve the light effect; reflector 7 folds the light path to reduce the length of the light path; lens 8 projects the LCD screen 5 to form an image; and projects a projection picture 9.

[0041] Example 2

[0042] In this embodiment, the movement direction of the heat dissipation fluid is as follows: Figure 4 As indicated by the middle arrow, it moves from top to bottom.

[0043] LED1, as a light source, emits light 100; light cone 2 reflects the large-angle light emitted by LED1 into small-angle light and enters collimator 3 to improve the collimation efficiency. Since the direction of the heat dissipation fluid is from top to bottom, it can be known from the propagation process of light 100 that the high-temperature position of LCD screen 5 corresponds to the reflection surface below light cone 2, so the reflection of the short wavelength of light 100 by the reflection surface above light cone 2 is improved to compensate for the color unevenness and brightness uniformity affected by high temperature; collimator 3 uses Fresnel mirror to collimate light 100 coming out of light cone 2; heat-insulating glass 4 shares part of the energy of LCD screen 5 to improve heat dissipation efficiency; LCD screen 5 is a display screen; field lens 6 uses Fresnel mirror to focus the collimated light to improve the light effect; different from embodiment 1, this embodiment does not have reflector 7, and the light is projected onto LCD screen 5 through lens 8 to form an image; projecting picture 9.

[0044] Finally, the present invention should explain that: the above embodiments are detailed descriptions of the technical solutions of the present invention and are not limited to the aforementioned embodiments. Those skilled in the art should understand that modifications or replacements of the features and parameters in the aforementioned embodiments do not deviate from the spirit and scope of the technical solutions of the aforementioned embodiments.

Claims

1. A projector optical device with a multi-material light cone, characterized in that: include: LED (1), light cone (2), collimator (3), heat-insulating glass (4), LCD screen (5), field lens (6) and lens (8); An LED (1), a light cone (2), a collimating lens (3), a heat-insulating glass (4), an LCD screen (5) and a field lens (6) are arranged in sequence along the optical path; The LED (1) is used as a light source to emit light; The light cone (2) is in the shape of a rhombus and comprises at least two reflective surfaces with different reflective spectra; After being reflected by the reflective surface, the light passes through the collimator (3), the heat-insulating glass (4), the LCD screen (5) and the field lens (6) in sequence and enters the lens (8); A heat dissipation channel (10) is formed between the LCD screen (5) and the heat-insulating glass (4), wherein the heat dissipation channel (10) comprises an inlet (11) and an outlet (12), and heat dissipation fluid enters the heat dissipation channel (10) from the inlet (11) and is discharged from the heat dissipation channel (10) through the outlet (12); The reflectivity of the reflective surface corresponding to the entrance (11) for short wavelengths is higher than the reflectivity of the reflective surface corresponding to the exit (12).

2. A projector optical device with a multi-material light cone according to claim 1, characterized in that: The reflective surface (21) is a reflective film layer bonded to the light cone (2).

3. A projector optical device with a multi-material light cone according to claim 1, characterized in that: The reflective surface (21) is a reflective coating provided on the light cone (2) by spraying or chemical plating.

4. The projector optical device of a multi-material light cone according to claim 1, characterized in that: The collimating mirror (3) is a Fresnel mirror.

5. The projector optical device of a multi-material light cone according to claim 1, characterized in that: The field lens (6) is a Fresnel lens.

6. The projector optical device of a multi-material light cone according to claim 1, characterized in that: The large-angle light emitted by the LED (1) passes through the light cone (2) and becomes small-angle light, which is incident on the collimator (3).

7. The projector optical device of a multi-material light cone according to claim 1, characterized in that: It also comprises a reflector (7), wherein the reflector (7) reflects the light passing through the field lens (6) into the lens (8).

8. The projector optical device of a multi-material light cone according to claim 1, characterized in that: The reflectivity of the reflective surface corresponding to the outlet (12) for long wavelengths is higher than the reflectivity of the reflective surface corresponding to the inlet (11).

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