CN201233497Y - LCD projector - Google Patents

Abstract

The utility model discloses a LCD projector, it includes that casing, LCD, projecting mirror group are organized, its technical essential lies in still including LED light source, condenser lens group, is equipped with the LED light source of perpendicular main optical axis in the casing in proper order, is used for the condenser lens group that converges light source light and shines LCD, is used for the projecting mirror group that will pass LCD light projection and go out, condenser lens group, LCD, projecting mirror group separate certain distance setting. The utility model aims at overcoming the defects of low light energy utilization rate and large volume of the existing LCD projector and providing the LCD projector with high light energy utilization rate and small volume.

Description

A kind of LCD projector

【Technical field】

The utility model relates to a projector, in particular to an LCD projector.

【Background technique】

LCD liquid crystal display is the abbreviation of Liquid Crystal Display. The structure of LCD is to place liquid crystals in two parallel glasses. There are many small vertical and horizontal wires in the middle of the two glasses. The rod-shaped crystal molecules are controlled by electrification or not. Change the direction and refract the light to produce a picture. The LCD liquid crystal projector utilizes the electro-optic effect of the liquid crystal, and the brightness, color, contrast, etc. of the light passing through the LCD can be controlled through the circuit. LCD liquid crystal projector, the projection screen color reproduction is real, and the color saturation is high; Shortcomings.

【Content of utility model】

The purpose of the utility model is to provide an LCD projector with high light energy utilization rate and small volume in order to overcome the disadvantages of low light energy utilization rate and large volume of existing LCD projectors.

In order to solve the above-mentioned technical problems, the utility model adopts the following technical solutions:

An LCD projector, comprising a housing, an LCD, and a projection lens group, is characterized in that it also includes an LED light source and a condenser lens group, and the housing is sequentially provided with an LED light source perpendicular to the main optical axis, which is used to converge light from the light source and shine it on the The condensing lens group of the LCD, the LCD, and the projection lens group for projecting the light passing through the LCD, the condensing lens group, the LCD, and the projection lens group are arranged at a certain distance;

As mentioned above, the condenser lens group includes three condenser lenses, wherein the first condenser lens is a lens with a concave surface and a convex surface on the other side, the LED light source is arranged in the concave surface of the first condenser lens, and the second condenser lens is convex on both sides. A lens, wherein the third condenser lens is a lens with convex surfaces on both sides; the first condenser lens, the second condenser lens, and the third condenser lens are arranged at a certain distance apart, and the convex surface of the first condenser lens is adjacent to the second condenser lens;

As mentioned above, the projection mirror group includes two projection mirrors, wherein the first projection mirror is a lens with a convex surface on both sides, and the second projection mirror is a lens with a concave surface on one side and a convex surface on the other side; the second projection mirror is set On the outer side of the casing and its convex surface faces the outside of the casing, its concave surface is adjacent to the first projection mirror.

Compared with the prior art, the utility model has the following advantages:

1. High light utilization efficiency, higher image quality and higher brightness; because the lens group makes full use of all the light emitted by the LED, so that the light finally projected on the external projection screen is sufficient;

2. The use of LED light source is environmentally friendly, and it emits very little heat; LED is a super-high-intensity, super-high-brightness light produced by superconducting light-emitting crystals; it has a long lifespan, which can reach 100,000 hours; super power saving, super low cost;

3. Due to the use of LEDs, the volume of the part that provides the lighting source is reduced; at the same time, because the lens group converges the light and shortens the entire optical path, the volume is also greatly reduced; therefore, the projector is smaller in size, lighter in weight, and the manufacturing process is simpler.

【Description of drawings】

Fig. 1 is the optical path schematic diagram of the present utility model;

Fig. 2 is a perspective view of the utility model;

Fig. 3 is a schematic diagram of structural decomposition of the utility model;

Fig. 4 is an exploded view of the structure of the utility model.

【Detailed ways】

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail:

See Figures 1, 3, and 4. A kind of LCD projector, comprises housing 1, LCD2, projection lens group 5, is characterized in that also comprises LED light source 4, condenser lens group 3, is provided with the LED light source of vertical main optical axis 6 in sequence in the housing, is used for light source The light converges and illuminates the condenser lens group of the LCD, the LCD, and the projection lens group for projecting the light passing through the LCD. The condenser lens group, the LCD, and the projection lens group are arranged at a certain distance.

The light emitted by the LED light source is converged after passing through the condenser lens group and projected onto the liquid crystal panel.

The angle of light emitted by the LED light source is large, and the outermost light on both sides is close to the vertical main optical axis and the angle is close to 180 degrees. In order to ensure full use of light and improve the brightness of projection onto the projection screen, a condenser lens group is designed. The condenser lens group 3 comprises three condenser lenses, wherein the first condenser lens 31 is a lens with a concave surface and a convex surface on the other side, the LED light source is arranged in the concave surface of the first condenser lens, and wherein the second condenser lens 32 is both convex surfaces Lens, wherein the third condenser lens 33 is the lens that both sides are convex; . The concave surface of the first condenser lens wraps the LED light source in it. The light emitted by the LED light source is nearly 180 degrees away from the main optical axis and diverges outward. After passing through the first condenser lens, the angle between the light and the main axis becomes smaller but still diverges outward. After passing through the second condenser lens, the light is nearly parallel or parallel to the main axis, and after passing through the third condenser lens, the light is concentrated toward the main axis, and then projected onto the LCD.

The projection mirror group 5 comprises two projection mirrors, wherein the first projection mirror 51 is a lens with a convex surface on both sides, and the second projection mirror 52 is a lens with a concave surface on one side and a convex surface on the other side; On the outer side of the casing and its convex surface faces the outside of the casing, its concave surface is adjacent to the first projection mirror. The light refracted by the LCD passes through the first projection mirror and gathers at one point, then the light continues to travel through the second projection mirror, then diverges and is projected onto the projection screen outside the casing.

Claims (3)

1. An LCD projector, comprising a housing (1), an LCD (2), and a projection lens group (5), is characterized in that it also includes an LED light source (4), a condenser lens group (3), and the housing is successively provided with The LED light source perpendicular to the main optical axis (6), the condenser lens group for converging the light from the light source and shining it on the LCD, the LCD, and the projection lens group for projecting the light passing through the LCD, the condenser lens group, the LCD, and the projector The mirror groups are arranged at a certain distance apart. 2. The LCD projector according to claim 1, wherein the condenser lens group (3) comprises three condenser lenses, wherein the first condenser lens (31) is a lens with a concave surface on one side and a convex surface on the other, The LED light source (4) is arranged in the concave surface of the first condenser, wherein the second condenser (32) is a convex lens on both sides, and the third condenser (33) is a convex lens on both sides; the first condenser The condenser, the second condenser and the third condenser are arranged at a certain distance, and the convex surface of the first condenser is adjacent to the second condenser. 3. An LCD projector according to claim 1 or 2, characterized in that the projection mirror group (5) includes two projection mirrors, wherein the first projection mirror (51) is a lens with convex surfaces on both sides , wherein the second projection mirror (52) is a lens with a concave surface on one side and a convex surface on the other; adjacent.

Images