TWI629510B - Optical reflection module of head up display - Google Patents

Abstract

An optical reflection module for a head-up display for reflecting an image light generated by an image generator to an image forming portion for imaging on the image forming portion, comprising: a plurality of mirrors, a curved mirror, And a back-end mirror; wherein the multi-mirror reflects the image light to the curved mirror, and then the curved mirror reflects the image light to the multiple mirror, and then the multiple mirror reflects the image light To the back end mirror.

Description

Optical reflection module for heads up display

The present invention relates to heads up displays, and more particularly to an optical reflective module for a heads up display.

The Head Up Display (HUD) was first appeared on military aircraft. The purpose is to let the pilot not have to look down at the display and data of the instrument, always maintain the posture of the head, and reduce the rapid change of the external environment between the head and the head. Eye focal lengths require constant adjustments resulting in delays and discomfort.

With the advancement of technology, more and more vehicles have begun to be equipped with head-up displays in recent years. The heads-up display uses the principle of optical reflection to project some important information on a piece of glass in front of the pilot or driver to reduce the frequency at which the pilot needs to look down at the meter, avoiding interruption of attention and loss of state awareness.

The general heads-up display includes two main architectures: an image processing system and an image display system. The image processing system converts the data to be displayed into a graphic or text to be displayed, and generates an image signal. The image display system projects the image signal onto the aforementioned glass. A typical image display system includes a plurality of mirrors for reflecting the image signal onto the glass sheet.

In recent years, image display systems have a larger volume than image processing systems, and mirrors in image display systems are particularly bulky components. In order to reduce the size of the head-up display, it can be installed in a small space. Improvements to the image display system are very important.

SUMMARY OF THE INVENTION A primary object of the present invention is to provide an optical reflective module for a heads-up display that has a small volume and weight so that the heads-up display can be mounted in a small space.

In order to achieve the foregoing object, the optical reflection module of the head-up display of the present invention is configured to reflect an image light generated by an image generator to an image forming portion for imaging the optical reflection mode on the image forming portion. The group has a plurality of mirrors that are reflected by the multiple mirrors at least twice.

The optical reflection module of the head-up display further includes: a plurality of mirrors, a curved mirror, and a back-end mirror; wherein the plurality of mirrors reflect the image light to the curved mirror, The curved mirror then reflects the image light to the multiple mirror, and then the multiple mirror reflects the image light to the back end mirror.

The optical reflection module of the head-up display provided by the invention can achieve the same optical effect by using a small number of mirrors, and has the advantages of small volume, light weight, low cost and the like.

10‧‧‧Image Generator

20‧‧‧Image Department

FM‧‧‧ front end mirror

MM‧‧‧ multiple mirrors

CM‧‧‧ curved mirror

RM‧‧‧Back end mirror

Figure 1 is a schematic view of a first preferred embodiment of the present invention.

Figure 2 is a schematic view of a second preferred embodiment of the present invention.

Figure 3 is a schematic view of a third preferred embodiment of the present invention.

Figure 4 is a schematic view of a fourth preferred embodiment of the present invention.

Figure 5 is a schematic view of a fifth preferred embodiment of the present invention.

Referring to FIG. 1 , an optical reflection module of a head-up display according to a first preferred embodiment of the present invention has an object side and an image side, and an image generator 10 is disposed on the object side, thereby generating a The image light has an image forming portion 20 on the image side, and the image light will be imaged there. The optical reflection module further has a front end mirror FM, a multiple mirror MM, a curved mirror CM, and a rear end mirror RM. The front end mirror FM, the multiple mirror MM and the rear end mirror RM are both plane mirrors; the curved mirror CM is a concave mirror having a radius of curvature of -668.000000 mm.

After being emitted by the image generator 10, the image light is first reflected by the front end mirror FM, and the central incident angle is 18.1 degrees, and then the first reflection is sequentially performed by the multiple mirror MM, and the central incident angle is 23.9. Degree, the curved mirror CM reflects, the central incident angle is 10.2 degrees, the multiple reflection mirror MM performs a second reflection, the central incident angle is 41 degrees, and finally is reflected by the rear end mirror RM, and The image light is reflected to the image forming portion 20.

The optical characteristics of each of the mirrors of the first preferred embodiment are listed in Table 1:

As can be seen from the above description, the image light is reflected twice for the multiple mirror MM during the transmission from the image generator 10 to the image forming unit 20, so that a part of the image light path is in the multiple times. The mirror MM and the curved mirror CM overlap. In this way, not only the number of mirrors required by the optical reflection module can be reduced, but also the volume of the optical reflection module is reduced, so that the optical reflection module of the invention has a small volume and a light weight. And lower cost and other characteristics.

Referring to FIG. 2, an optical reflection module of a head-up display according to a second preferred embodiment of the present invention has an object side and an image side, and an image generator 10 is disposed on the object side, thereby generating a The image light has an image forming portion 20 on the image side, and the image light will be imaged there. The optical reflection module has a plurality of mirrors MM, a curved mirror CM, and a rear mirror RM. The back mirror RM and the multiple mirror MM are plane mirrors; the curved mirror CM is a concave mirror having a radius of curvature of -1405.57781 mm.

After the image light is emitted by the image generator 10, the first reflection is performed by the multiple mirror MM in sequence, the central incident angle is 23.9 degrees, and the curved mirror CM reflects, and the central incident angle is 9.2 degrees. The multiple mirror MM performs a second reflection with a central incident angle of 42.3 degrees, and finally the image light is reflected by the back end mirror RM to the image forming portion 20.

The optical characteristics of each of the mirrors of the second preferred embodiment are listed in Table 2: Table 2

The optical reflection module of the second preferred embodiment has the same optical effects and features as those of the first preferred embodiment, and is not described herein.

Referring to FIG. 3, an optical reflection module of a head-up display according to a third preferred embodiment of the present invention has an object side and an image side, and an image generator 10 is disposed on the object side, thereby generating a The image light has an image forming portion 20 on the image side, and the image light will be imaged there. The optical reflection module has a plurality of mirrors MM, a curved mirror CM, and a rear mirror RM. The back mirror RM is a plane mirror; the multiple mirror MM is a concave mirror having a radius of curvature of 78920.46726 mm; the curved mirror CM is a concave mirror having a radius of curvature of -376.973185 mm.

After the image light is emitted by the image generator 10, the first reflection is performed by the multiple mirror MM in sequence, the central incident angle is 24.3 degrees, and the curved mirror CM reflects, and the central incident angle is 8.9 degrees. The multiple mirror MM performs a second reflection with a central incident angle of 42.6 degrees, and finally the image light is reflected by the back end mirror RM to the image forming portion 20.

The optical characteristics of each of the mirrors of the third preferred embodiment are listed in Table 3: Table 3

In the third preferred embodiment, the sag of each curved mirror is calculated by the following formula:

Where: z is the degree of dishing of the mirror parallel to the z-axis; c is vertex curvature (CUY); k is a conic constant; and Cj is a constant of x ^m y ⁿ .

The curved mirror of the third preferred embodiment, the parameters of the multiple mirror MM and the curved mirror CM, are listed in the following table:

The optical reflection module of the third preferred embodiment has the same optical effects and features as the preferred embodiment described above, and is not described herein.

Referring to FIG. 4, an optical reflection module of a head-up display according to a fourth preferred embodiment of the present invention has an object side and an image side, and an image generator 10 is disposed on the object side, thereby generating a The image light has an image forming portion 20 on the image side, and the image light will be imaged there. The optical reflection module has a plurality of mirrors MM, a curved mirror CM, and a rear mirror RM. The back-end mirror RM and the multiple-mirror MM are plane mirrors; the curved mirror CM is a concave mirror having a radius of curvature of -520.000000 mm.

After the image light is emitted by the image generator 10, the first reflection is performed by the multiple mirror MM in sequence, the central incident angle is 31 degrees, and the curved mirror CM reflects, and the central incident angle is 9.5 degrees. The multiple mirror MM performs a second reflection with a central incident angle of 50 degrees, and finally the image light is reflected by the rear end mirror RM to the image forming portion 20.

The optical characteristics of each of the mirrors of the fourth preferred embodiment are listed in Table 4:

The optical reflection module of the fourth preferred embodiment has the same optical effects and features as the foregoing preferred embodiments, and is not described herein.

Referring to FIG. 5, an optical reflection module of a head-up display according to a fifth preferred embodiment of the present invention has an object side and an image side, and an image generator 10 is disposed on the object side, thereby generating a The image light has an image forming portion 20 on the image side, and the image light will be imaged there. The optical reflection module further has a front end mirror FM, a multiple mirror MM, a curved mirror CM, and a rear end mirror RM. The back-end mirror RM and the multiple-mirror MM are both plane mirrors; the curved mirror CM is a concave mirror having a radius of curvature of -1405.577881 mm; and the front-end mirror FM is also a concave mirror having a radius of curvature It is -884.664951mm.

After being emitted by the image generator 10, the image light is first reflected by the front end mirror FM, and the central incident angle is 12.8 degrees, and then the first reflection is sequentially performed by the multiple mirror MM, and the central incident angle is 19.4. Degree, the curved mirror CM reflects, the central incident angle is 10 degrees, the multiple anti- The mirror MM performs a second reflection with a central incident angle of 39.4 degrees, and is finally reflected by the rear end mirror RM to reflect the image light to the image forming portion 20.

The optical characteristics of each of the mirrors of the fifth preferred embodiment are as listed in Table 5:

The optical reflection module of the fifth preferred embodiment has the same optical effects and features as the foregoing preferred embodiment, and is not described herein.

The present invention utilizes the multiple mirror MM to reflect the image light twice. In this way, not only the number of mirrors required by the optical reflection module can be reduced, but also the volume of the optical reflection module is reduced, so that the optical reflection module of the invention has a small volume and a light weight. And lower cost and other characteristics.

The above embodiments are merely illustrative of the technology of the present invention and its effects, and are not intended to limit the present invention. Anyone skilled in the art can do without departing from the technical principles and spirit of the present invention. In the following, the above embodiments are modified and changed, and therefore the scope of protection of the present invention should be as set forth in the claims below.

Claims (16)

A heads-up display comprising: an image generator for generating an image light; an optical reflection module having a plurality of mirrors for reflecting the image light; and an imaging portion through which the optical reflection module The image light reflected by the mirror is imaged thereon; wherein the mirrors of the optical reflection module have a plurality of mirrors, and the image light is reflected by the multiple mirrors at least twice; the optical reflection The mirrors of the module have a front end mirror, and the image light is reflected by the front end mirror, and then the first reflection is performed by the multiple mirrors. The head-up display of claim 1, wherein the mirrors of the optical reflection module further have a curved mirror; after the image light is first reflected by the multiple mirrors and the multiple mirrors The image ray is reflected by the curved mirror before the second reflection. The head-up display of claim 2, wherein the curved mirror is a concave mirror having a radius of curvature of between -1405.57781 mm and -376.973185 mm. The head-up display of claim 2, wherein the multiple mirror is a concave mirror, and the curved mirror is a concave mirror. The head-up display of claim 2, wherein the multiple mirror is a plane mirror, and the curved mirror is a concave mirror. A heads up display according to claim 1, wherein the front end mirror is a concave mirror. The head-up display of claim 1, wherein the multi-reflector first reflects the central incident angle of the image light between 39.4 and 50 degrees. The head-up display of claim 1, wherein the multiple-reflection mirror reflects the central incident angle of the image light for a second time between 19.4 degrees and 31 degrees. The heads-up display of claim 2, wherein the curved mirror reflects the central incident angle of the image light between 8.9 and 10.2 degrees. The head-up display of claim 1, wherein the front end mirror reflects the central incident angle of the image light between 8.1 and 12.8 degrees. An optical reflection module for a head-up display for reflecting an image light generated by an image generator to an image forming portion for imaging on the image forming portion, comprising: a plurality of mirrors and a curved mirror; The multiple mirror reflects the image light to the curved mirror, and then the curved mirror reflects the image light to the multiple mirror; wherein the multiple mirror reflects the central incident angle of the image light for the first time It is between 39.4 degrees and 50 degrees; the second reflection of the image light has a central incident angle of between 19.4 degrees and 31 degrees. The optical reflection module of the head-up display of claim 11, wherein the curved mirror is a concave mirror having a radius of curvature of between -1405.57781 mm and -376.973185 mm. The optical reflection module of the head-up display of claim 11, wherein the multiple mirror is a concave mirror, and the curved mirror is a concave mirror. The optical reflection module of the head-up display of claim 11, wherein the multiple mirror is a plane mirror, and the curved mirror is a concave mirror. The optical reflection module of the head-up display of claim 11, wherein the curved mirror reflects the central incident angle of the image light between 8.9 and 10.2 degrees. The optical reflection module of the head-up display of claim 11, further comprising a front end mirror, the image light being reflected by the front end mirror and then reflected by the multiple mirror; wherein the front end mirror reflects the image The central incident angle of the light is between 8.1 and 12.8 degrees.