CN105204149B

CN105204149B - Passive directional reflecting imaging device

Info

Publication number: CN105204149B
Application number: CN201510719466.1A
Authority: CN
Inventors: 施慧; 吴凡; 吴东辉
Original assignee: Individual
Current assignee: Shandong Jiumu Hydrogen Energy Technology Co ltd
Priority date: 2015-10-30
Filing date: 2015-10-30
Publication date: 2021-05-11
Anticipated expiration: 2035-10-30
Also published as: CN105204149A

Abstract

The invention relates to the field of screen imaging, in particular to a passive directional reflective imaging device. The method is characterized in that: the device consists of a directional reflecting unit, wherein the directional reflecting unit at least comprises a lens, a reflector and a displacement piece, and the displacement piece drives the reflector to enable the distance or the relative position between the reflector and the lens to be correspondingly changed according to an input signal. The beneficial effects are that: a passive directional reflection imaging device is provided, namely a directional reflection unit (namely pixel) is driven by a video signal to modulate an external light source to form a pixel brightness gray scale, and an image (static or moving image) is synthesized by the whole directional reflection unit (namely pixel) and is used for forming an image by the external light source irradiation, such as a car lamp irradiation advertisement, a warning board and the like.

Description

Passive directional reflecting imaging device

Technical Field

The invention relates to the field of screen imaging, in particular to a passive directional reflective imaging device.

Background

The essence of screen imaging, such as LED spot imaging, is the collection of all spots (pixels) of different brightness, which form moving images when the brightness of the spots changes, and the brightness change of each spot is driven by a video signal, and the spot is actively illuminated.

Disclosure of Invention

The invention aims to provide a passive directional reflection imaging device, namely, a directional reflection unit (namely a pixel) is driven by a video signal to modulate an external light source to form a pixel brightness gray scale, and an image (a still image or a moving image) is synthesized by the whole directional reflection unit (namely the pixel) and is used for forming an image by the illumination of the external light source, such as a car lamp illumination advertisement, a warning board and the like.

The technical scheme adopted by the invention is as follows:

a passive directional reflecting imaging device is characterized in that: the device consists of a directional reflecting unit, wherein the directional reflecting unit at least comprises a lens, a reflector and a displacement piece, and the displacement piece drives the reflector to enable the distance or the relative position between the reflector and the lens to be correspondingly changed according to an input signal.

The passive directional reflecting imaging device is characterized in that: the displacement piece consists of an electromagnet and an armature, wherein the electromagnet applies signal voltage to drive the armature to drive the reflector so that the distance between the reflector and the lens changes along with the input signal.

Or, the passive directional reflecting imaging device is characterized in that: the displacement member is a piezoelectric device which applies a signal voltage to drive the reflective mirror so that the distance between the reflective mirror and the lens changes with the input signal.

Further, the method is simple. The passive directional reflecting imaging device is characterized in that: the lens is a non-denier lens.

Still further, the passive directional reflecting imaging device is characterized in that: the adjacent directional reflecting units of the device are respectively a directional reflecting unit G covered with green filter materials, a directional reflecting unit B covered with blue filter materials and a directional reflecting unit R covered with red filter materials.

Still further, the passive directional reflecting imaging device is characterized in that: the non-denier lens is a non-denier spherical lens.

The passive directional reflecting imaging device is characterized in that: the adjacent directional reflecting units of the device are respectively a directional reflecting unit G covered with green filter materials, a directional reflecting unit B covered with blue filter materials and a directional reflecting unit R covered with red filter materials.

The passive directional reflecting imaging device is characterized in that: the lens is a spherical lens, and the reflector is a spherical reflector.

Further, the radius of the spherical lens is r1, the radius of the spherical reflector is r2, and the following conditions are satisfied: r2= nr1/2(n-1), n being the refractive index of the spherical lens. The light intensity of the reflected light is maximum when the centers of the spherical lens and the spherical reflector are superposed.

The invention has the beneficial effects that: a passive directional reflection imaging device is provided, namely a directional reflection unit (namely pixel) is driven by a video signal to modulate an external light source to form a pixel brightness gray scale, and an image (static or moving image) is synthesized by the whole directional reflection unit (namely pixel) and is used for forming an image by the external light source irradiation, such as a car lamp irradiation advertisement, a warning board and the like.

Drawings

FIG. 1 is a retroreflective element (i.e., pixel) of a passive retroreflective imaging device.

FIG. 2 is a schematic view of a retroreflective element of the present invention employing spherical lenses.

Fig. 3 is an image forming apparatus composed of a retroreflective unit.

Fig. 4 is a schematic diagram of a retroreflective element of the present invention driven by a piezoelectric device.

Fig. 5 is a schematic diagram of a retroreflective element of the present invention driven by an electromagnet.

Fig. 6 is a graph showing the relationship between the displacement amount and the voltage u.

FIG. 7 is a graph showing the relationship between the luminance value and the voltage u.

Figure 8 is a version of the present invention employing a non-denier lens.

Detailed Description

The invention is further illustrated with reference to the following figures and examples.

Fig. 1 shows a retroreflective element (i.e., a pixel) of a passive retroreflective imaging device, wherein 101 is a lens, 102 is a mirror, and the focal point of the lens 101 is located on the curved solid surface of the mirror 102, so that when light from a light source 105 is directed to the lens 101, the light is focused on the focal point by the lens 101, and the mirror 102 located at the focal point reflects the light at the focal point to the lens 101, and the return light is scattered by the lens 101 to an observer's eye 104, and the return light is in the opposite direction to the incident direction, i.e., returns to the original path. The displacement member 103 is arranged, the displacement member 103 is driven to displace the reflector 102 and the lens 101, the distance between the focus point of the lens 101 and the reflecting point of the reflector 102 is changed, and the effect is that the light intensity of the return light is changed, namely, the distance change modulates the light intensity of the return light, the distance change is assumed to be driven by a voltage signal u, the brightness value and the displacement value of the return light are inversely proportional and linearly related within a certain range, fig. 6 is a relation graph of the displacement value and the voltage u, and fig. 7 is a relation graph of the brightness value and the voltage u, so that the return light carries modulation information of the signal u through modulation, each directional reflecting unit is equivalent to one pixel, and the brightness or the brightness change of the whole pixel is represented as a static image or a moving image. The brightness level is set to 255 gray levels in consideration of computer processing requirements.

Fig. 2 is a schematic diagram of a directional reflection unit of the present invention using a spherical lens, in the diagram, 201 is a spherical lens, r1 radius, 202 is a spherical reflector, r2 radius, the centers of circles of the spherical lens 201 and the spherical reflector 202 coincide, the spherical lens 201 is made of transparent material, such as glass, organic glass, etc., if the spherical lens is made of glass, it is equivalent to a convex lens, but it is not a common thin lens, the common lens formula can not be directly applied, and can be solved by using the law of refraction and calculus, and the processing method is: the set of intersection points of the extension line of the incident parallel light and the opposite extension line of the emergent light is defined as a main plane, the distance between the convergence point and the main plane is an equivalent focal length, the calculus solution equivalent focal length is f = nr1/2(n-1), n is the refractive index (relative refractive index to air) of the transparent substance, the refractive index of the general glass is 1.5-1.85, for example, assuming that n =1.5, focal length f = nr1/2(n-1) =1.5r1, n =1.85, focal length f = nr1/2(n-1) =1.85r1/1.7 = 1.09r1, therefore, the focus of the general glass sphere is within a range from the sphere center 1.09r 1-1.5 r1, and if n =2, focal length f = nr1/2(n-1) = r1, namely, the spherical lens 201 and the spherical reflector 202 coincide. The device of the invention requires r2= f at the equilibrium position, i.e. the spherical mirror position coincides with the equivalent focal plane, so r2= nr1/2(n-1), the light intensity of the reflected light at this position is maximum, the light intensity of the reflected light deviating from this position is reduced, a displacement member 103 is arranged, the displacement member 103 is driven to displace the spherical mirror 202 and the spherical lens 201, the distance between the focal point of the spherical lens 201 and the reflective point of the spherical mirror 202 is changed, the effect is that the light intensity of the returned light is changed, i.e. the distance change modulates the light intensity of the returned light, assuming that the distance change is driven by the voltage signal u, the brightness value and the displacement of the returned light are inversely proportional and in a linear relationship within a certain range, so that the returned light carries the modulation information of the signal u, each retroreflective element corresponds to a pixel, such that the brightness or brightness variation of the whole pixels appears as a still image or a moving image.

Fig. 3 shows an imaging device comprising retroreflective elements, 301 a screen of the imaging device, the screen comprising a plurality of retroreflective elements, the number of retroreflective elements determining the resolution, e.g. 30 thousands of retroreflective elements for an image pixel of 30 thousands. Further, three adjacent retroreflective elements are respectively set as 302 retroreflective element G (green), 303 retroreflective element B (blue) and 304 retroreflective element R (red), and the three adjacent retroreflective elements constitute one color element, so that a color image can be displayed. Specifically, 302 directional reflecting unit G (green) is covered with a green filter material, 303 directional reflecting unit B (blue) is covered with a blue filter material, and 304 directional reflecting unit R (red) is covered with a red filter material.

Fig. 4 is a schematic diagram of the retroreflective element of the present invention driven by a piezoelectric device, in which a piezoelectric device 401 is connected to the spherical mirror 202, and the piezoelectric device such as PZT device can expand and contract under the action of a voltage, and the spherical mirror 202 is displaced relative to the spherical lens 201 under the drive of a signal voltage u, so that the information of the signal voltage u is modulated on the reflective light.

Fig. 5 is a schematic diagram of the retroreflective unit of the present invention driven by an electromagnet, in which an armature 501 is connected to the

spherical mirror

202, and 502 is an electromagnet, and a signal voltage u is applied to an electromagnet coil, and the electromagnet attracts the armature, thereby driving the spherical mirror 202 to displace relative to the spherical lens 201, and thus information of the signal voltage u is modulated on the reflective light line.

Fig. 8 shows a scheme of the present invention using a non-denier lens, at least 801 is a non-denier lens including a non-denier spherical lens, and alternatively 802 is a non-denier mirror including a non-denier spherical mirror, all the schemes of the present invention can be replaced by the scheme shown in fig. 8, and the advantage of using the non-denier lens is that the structure is thinner and the material is saved.

Claims

1. A passive directional reflecting imaging device is characterized in that: the device comprises a screen which is composed of directional light reflecting units as pixels, wherein the directional light reflecting units have the functions of returning incident light in the original path, an external light source positioned at an observer irradiates the screen, the directional light reflecting units are driven by image signals to modulate the external light source to form pixel brightness gray level, and the observer obtains the original path returning light of all the directional light reflecting units to form an image;

the directional reflecting unit at least comprises a lens, a reflector and a displacement member, wherein the displacement member drives the reflector to enable the distance or the relative position between the reflector and the lens to be changed correspondingly according to an input signal.

2. A passive retroreflective imaging apparatus as defined in claim 1, wherein: the displacement piece consists of an electromagnet and an armature, wherein the electromagnet applies signal voltage to drive the armature to drive the reflector so that the distance between the reflector and the lens changes along with the input signal.

3. A passive retroreflective imaging apparatus as defined in claim 1, wherein: the displacement member is a piezoelectric device which applies a signal voltage to drive the reflective mirror so that the distance between the reflective mirror and the lens changes with the input signal.

4. A passive retroreflective imaging apparatus according to claim 1, 2 or 3, wherein: the lens is a spherical lens, and the reflector is a spherical reflector.

5. A passive retroreflective imaging apparatus as defined in claim 4, wherein: the focal length of the spherical lens is f, the radius of the spherical reflector is r2, and the following conditions are met: r2= f.

6. A passive retroreflective imaging apparatus as defined in claim 4, wherein: the radius of the spherical lens is r1, the radius of the spherical reflector is r2, and the following conditions are met: r2= nr1/2(n-1), n being the refractive index of the spherical lens.

7. A passive retroreflective imaging apparatus according to claim 1, 2 or 3, wherein: the adjacent directional reflecting units of the device are respectively a directional reflecting unit G covered with green filter materials, a directional reflecting unit B covered with blue filter materials and a directional reflecting unit R covered with red filter materials.

8. A passive retroreflective imaging apparatus according to claim 1, 2 or 3, wherein: the lens is a non-denier lens.

9. A passive retroreflective imaging apparatus as defined in claim 8, wherein: the non-denier lens is a non-denier spherical lens.

10. A passive retroreflective imaging apparatus as defined in claim 9, wherein: the adjacent directional reflecting units of the device are respectively a directional reflecting unit G covered with green filter materials, a directional reflecting unit B covered with blue filter materials and a directional reflecting unit R covered with red filter materials.

11. A passive retroreflective imaging apparatus as defined in claim 8, wherein: the adjacent directional reflecting units of the device are respectively a directional reflecting unit G covered with green filter materials, a directional reflecting unit B covered with blue filter materials and a directional reflecting unit R covered with red filter materials.