CN209765255U - Laser projector - Google Patents

Abstract

the utility model provides a laser projector, laser projector includes projection unit, light reflection unit includes the speculum, the speculum has negative focal power, and is the free form surface, projection unit's emergent light process reflect the imaging screen behind the speculum on, c, r, k are the constant, m, n are the positive integer the utility model has the advantages of simple structure, convenient assembling, projection luminance height.

Description

laser projector

Technical Field

The utility model relates to a projector, in particular to laser projector.

background

With the rapid development of technology and technology, the projection industry has gradually developed the field of micro projection new technology besides the large-scale projector frequently seen in daily life, and the Pico projector is exquisite, portable, entertaining and practical.

Because the projection ratio of the micro-projection equipment is large, the projection distance is large when a 20-inch picture is projected, and the experience of a customer is affected greatly. The arrangement of the micro-projection device in a limited space becomes very difficult, and the projection picture is small due to the large projection distance, so that the user cannot have the best user experience when watching the projection picture.

The problem is possibly solved due to the appearance of the laser micro-projection equipment, the laser light source micro-projection equipment has higher brightness than the LED light source micro-projection equipment, the shortage of picture brightness when a larger picture is projected is not needed to be worried about, and the laser micro-projection equipment still has a larger projection ratio. Therefore, how to reduce the projection ratio of the laser micro-projection device is an urgent problem to be solved.

The projection ratio of the laser micro-projection equipment is large, and a picture with a proper size can be projected only at a long distance, so that an area which can not be shielded by a user is too large when the user uses the equipment, and the user experience is very influenced. Under the environment with limited space, such as the rear windshield of a taxi, a picture with larger size cannot be projected, thereby influencing the normal delivery of taxi advertisements.

SUMMERY OF THE UTILITY MODEL

for solving not enough among the above-mentioned prior art scheme, the utility model provides a little, the undistorted, the simple structure's of image laser projector of throw ratio.

The utility model aims at realizing through the following technical scheme:

A laser projector comprising a projection unit, the laser projector further comprising:

A light reflection unit including a mirror having a negative power and being a free-form surface; emergent light of the projection unit passes through the reflector and then is reflected to an imaging screen, and the curved surface of the reflector meets the following requirements:c, r and k are constants, and m and n are positive integers.

Compared with the prior art, the utility model discloses the beneficial effect who has does:

1. The throw ratio is small;

The method reduces the projection distance under the condition of ensuring that the projection effect of the laser micro-projection equipment is not changed, thereby achieving the purpose of reducing the projection ratio, for example, the projection ratio can reach 0.5;

2. The image has no distortion and good color restoration;

The free-form surface reflector is used for expanding the light path of the laser micro-projection equipment, and the distortion of the projected picture is corrected through the proper optical design of the free-form surface reflector, so that the problem of picture distortion is avoided;

the method and the device have the advantages that no optical lens is used, so that aberration such as chromatic aberration possibly generated by the optical lens is effectively avoided, the color reduction degree of the picture is not lost, and the optimal color experience can be provided for audiences; meanwhile, because an optical lens is not used, the system does not have light blocking and extinction, the light transmittance and the peripheral light ratio can be improved as much as possible while no ghost is generated, high-efficiency projection is realized, and the projection brightness is increased;

3. the structure is simple, and the color is good;

The optical path part only uses one free-form surface reflector, so that the structure is simple, the processing is convenient, the assembly in production is convenient, the yield can be effectively improved, and the working time is shortened;

Through a reasonable optical layout: the free-form surface reflector is placed on the right side of the laser micro-projection device, the light path is changed, the light path is increased, and a large-angle picture with the horizontal width of 400mm can be projected on the left side of the free-form surface reflector through reflection.

Drawings

The disclosure of the present invention will become more readily understood with reference to the accompanying drawings. As is readily understood by those skilled in the art: these drawings are only intended to illustrate the technical solution of the present invention and are not intended to limit the scope of the present invention. In the figure:

Fig. 1 is a schematic view of a laser projector according to embodiment 1 of the present invention.

Detailed Description

fig. 1 and the following description depict alternative embodiments of the invention to teach those skilled in the art how to make and reproduce the invention. For the purpose of teaching the present invention, some conventional aspects have been simplified or omitted. Those skilled in the art will appreciate variations or substitutions from these embodiments that will be within the scope of the invention. Those skilled in the art will appreciate that the features described below can be combined in various ways to form multiple variations of the invention. Accordingly, the present invention is not limited to the following alternative embodiments, but is only limited by the claims and their equivalents.

example 1:

fig. 1 schematically shows a schematic structural diagram of a laser projector according to embodiment 1 of the present invention, and as shown in fig. 1, the laser projector includes:

A projection unit 10 as a light source and an image output; the projection unit is the prior art in the field, and the specific structure and working mode are not described herein;

A light reflection unit 20 including a mirror having a negative power and being a free-form surface; emergent light of the projection unit passes through the reflector and then is reflected to the imaging screen 30, and an included angle theta between the optical axis of the reflector and the normal line of the imaging screen is as follows:the curved surface of the reflector satisfies:

c, r and k are constants, and m and n are positive integers;

the position relation among the reflector, the projection unit and the imaging screen is as follows:

f isFocal length of the mirror, d₁Is the distance from the center of the mirror to the projection unit, d₂Is the distance from the center of the mirror to the center of the imaging screen. .

example 2:

According to the utility model discloses an application example of laser projector.

in this application example, the laser projector does not need to use a lens, and the light reflection unit only has one free-form surface reflector, and the parameters of the reflector are as follows: c-3.844 e-015, r-0.3739, k-0.0139, C₁＝2.809e-016、C₂＝-0.0005211，C₃＝4.182e-016、C₄＝0.0006725，C₅＝2.545e-017、C₆0.0001767; the structural data is:

numbering	Radius of	thickness of	Refractive mode
				OBJ	Inf	Inf
2	Inf	30
				3	Inf	-230	reflection
IMG	inf	0

Angle between optical axis of reflector and normal line of imaging screend₁＝30mm，d₂The throw ratio was 0.5 at 200 mm.

Claims (6)

1. A laser projector comprising a projection unit, characterized in that: the laser projector further includes:

a light reflection unit including a mirror having a negative power and being a free-form surface; emergent light of the projection unit passes through the reflector and then is reflected to an imaging screen, and the curved surface of the reflector meets the following requirements:

c, r and k are constants, and m and n are positive integers.

2. The laser projector of claim 1, wherein: the light reflection unit has only one piece of the reflecting mirror.

3. the laser projector of claim 1, wherein: the laser projector does not require a lens.

4. the laser projector of claim 1, wherein: said counterThe included angle theta between the optical axis of the reflector and the normal line of the imaging screen is as follows:

5. The laser projector of claim 1, wherein: c-3.844 e-015, r-0.3739, k-0.0139, C₁＝2.809e-016、C₂＝-0.0005211，C₃＝4.182e-016、C₄＝0.0006725。

6. the laser projector of claim 1, wherein: the position relation among the reflector, the projection unit and the imaging screen is as follows:

f is the focal length of the mirror, d₁is the distance from the center of the mirror to the projection unit, d₂is the distance from the center of the mirror to the center of the imaging screen.