KR100720591B1 - potable projector - Google Patents

Abstract

A portable projector, comprising: a light transmitting member and light emitted to a first surface of the member in accordance with an external image signal to be transmitted into the member, and a red laser light source, a green laser light source, and a blue laser light source. A first light source for diffracting light incident from the red laser light source to the second surface of the member, a first mirror for reflecting light diffracted from the first lens, light incident from the green laser light source, and a first light source. A second lens for diffracting light reflected from the first mirror to a second surface of the member, a second mirror for reflecting light diffracted from the second lens, light incident from a blue laser light source and light reflected from the second mirror A third lens diffracted to the second surface of the member, a third mirror reflecting light diffracted from the third lens, and a diffraction lens diffracting light reflected from the third mirror. And, a diffracted light from the diffraction lens is configured to include a scanning mirror for scanning in accordance with an external control signal.

Light transmitting member, first, second, third lens, beam splitter

Description

Portable projector

1 is a view showing the configuration of a typical single-plate projector

2 is a view showing the configuration of a typical three-panel projector

3 is a perspective view showing a portable projector according to the present invention

4A and 4B are a perspective view and a cross-sectional view showing a grating structure of the second and third lenses used in the present invention.

5A and 5B are schematic views showing a mobile laser projector phone to which a portable projector according to the present invention is applied.

Explanation of symbols for main parts of the drawings

50 light transmitting member 51 light source

52, 53, 54: first, second, third lens

55, 56, 57: first, second, third mirror

58: diffractive lens 59: scan mirror

The present invention relates to a projector, and more particularly to a portable projector.

Recently, display devices are becoming lighter and thinner, as well as larger screens, and among various display devices, a projector has been spotlighted as a display device for implementing a large screen of 100 inches or more.

Such a projector projects an image generated from a micro device such as a transmissive liquid crystal display (LCD) panel, a reflective liquid crystal on silicon (LCoS) panel, or a digital micromirror device (DMD) panel on a screen to display a screen. It is a device to form.

In general, projectors are classified into single-plate, two- and three-panel projectors according to the number of micro devices used.

Here, the single-plate projector is a method of illuminating a single micro device by separating the color from light in time, and the two-panel projector is a method of illuminating two micro devices by separating the color from light in space and time. Projectors illuminate three microelements by spatially separating colors from light.

1 is a view showing the configuration of a typical single-panel projector, Figure 2 is a view showing the configuration of a typical three-panel projector.

As shown in FIG. 1, the single-plate projector includes a light source 2, a color drum 3, a rod lens 4, illumination lenses 5.6, a micro element 7, a prism 8, and a projection lens. 1) and the like.

In a single-plate projector, the light generated from the light source is separated into red light, green light, and blue light through a color drum, and each light has a uniform brightness while passing through a rod lens, and then enters a micro device through illumination lenses and a prism. do.

The incident light has an image signal through the micro device, and is then projected onto the screen through the prism and the projection lens.

In addition, as shown in FIG. 2, the three-panel projector uses a dichroic mirror 9 to separate the light generated by the light source 2, and the separated red light, green light, and blue light respectively correspond. Incident on the LCD panel 10, the incident light is synthesized and projected onto the screen through the projection lens 1.

However, the existing projectors configured as described above require very large space because not only a large number of optical elements are required but also an optical system must be three-dimensionally constructed.

This configuration of the optical system has a limit to downsizing the size of the projector itself.

In addition, the conventional projector has a long path of light from the light source to the projection lens, so there is a limit in expressing bright and clear images due to light loss.

In addition, the conventional projector has a problem that the arrangement of the optical elements is unstable because the configuration of the optical system is three-dimensional.

SUMMARY OF THE INVENTION An object of the present invention is to provide a portable projector that can minimize the light path to reduce light loss and downsize.

Another object of the present invention is to provide a portable projector that can obtain high efficiency and brightness by synthesizing the laser light of the red, green, and blue laser light sources into one optical axis.

The portable projector according to the present invention emits light to the first side of the member according to an optically transmissive member and an external image signal to be transmitted into the member, and includes a red laser light source, a green laser light source, and a blue laser light source. And a first lens supported on the first surface of the member and diffracting light incident from the red laser light source to the second surface of the member, and supported on the second surface of the member, diffracted from the first lens. A first mirror for reflecting the reflected light, a second lens supported on the first surface of the member and diffracting the light incident from the green laser light source and the light reflected from the first mirror onto the second surface of the member, A second mirror supported on the second surface and reflecting light diffracted from the second lens, and reflected from the second mirror and light incident on the first surface of the member and incident from a blue laser light source A third lens for diffracting the reflected light to the second surface of the member, a third mirror supported on the second surface of the member and reflecting light diffracted from the third lens, and supported on the first surface of the member, and And a diffraction lens for diffracting the light reflected from the three mirrors, and a scan mirror supported on the second surface of the member and scanning the light diffracted from the diffraction lens according to an external control signal.

Here, the light transmissive member may be a hollow type member in which glass, plastic, air or vacuum is inside, and may have a linear and flat surface.

The areas where the first, second, third lenses, first, second, third mirrors, diffractive lenses, and scan mirrors are supported among the entire surfaces of the light transmitting member are projected or hollowed out. can do.

In addition, a 1st, 2nd, 3rd lens, a 1st, 2nd, 3rd mirror, a diffraction lens, and a scanning mirror are a flat plate type.

The first, second, and third lenses have a grating angle at which the laser light is incident to have a grating angle that converges the laser light, and a plane at which the laser light is emitted has a grating angle that changes a path of the laser light. It may be an optical element.

The second lens may be provided with a beam splitter that totally reflects the red wavelength and transmits the green wavelength to a surface on which the light reflected from the first mirror is incident, and the third lens is configured to receive the light reflected from the second mirror. A beam splitter may be installed on the surface to reflect totally the red and green wavelengths and transmit the blue wavelengths.

Other objects, features and advantages of the present invention will become apparent from the following detailed description of embodiments taken in conjunction with the accompanying drawings.

Hereinafter, with reference to the accompanying drawings illustrating the configuration and operation of the embodiment of the present invention, the configuration and operation of the present invention shown in the drawings and described by it will be described as at least one embodiment, By the technical spirit of the present invention described above and its core configuration and operation is not limited.

3 is a perspective view showing a portable projector according to the present invention.

As shown in FIG. 3, the projector of the present invention includes a transmissive member 50, a light source 51, first, second, third lenses 52, 53, 54, first, second, It consists of the 3rd mirrors 55, 56, 57, the diffraction lens 58, and the scan mirror 59. As shown in FIG.

Here, the light transmissive member 50 may be glass, plastic, a hollow type member having an air or a vacuum therein, or any material that can transmit light well, and may be light transmissive according to an optical design. The size of the member 50 is determined.

In some cases, the cross section of the light transmissive member 50 may be manufactured as a circle, a semicircle, a triangle, a polygon, or the like.

In the embodiment of the present invention, the light transmissive member 50 is manufactured to have a linear and flat surface.

Further, according to the design, the first, second, third lenses 52, 53, 54, the first, second, third mirrors 55, 56, 57 of the entire surface of the light transmissive member 50, The area where the diffractive lens 58 and the scan mirror 59 are supported may be fabricated so that the surface is projected or hollowed out.

The light source 51 emits light to the first surface of the member according to an external image signal so that the light is transmitted into the light transmissive member.

Here, the light source 51 is comprised of the red laser light source 51a, the green laser light source 51b, and the blue laser light source 51c, and is supported on the first surface of the light transmissive member 50 or predetermined from the first surface. It may be supported by another member apart from the gap.

In addition, the first lens 52 is supported on the first surface of the member 50 and diffracts the light incident from the red laser light source 51a to the second surface of the member 50.

Here, the first lens 52 may use a diffraction optical element (DOE) lens or the like, and various DOE lenses may be used according to the design of the optical system.

The first lens 52 is manufactured to have a different state of grating of an upper surface to which the laser light is incident and a lower surface to which the laser light is emitted.

4A and 4B, the surface on which the laser light is incident has a grating angle for converging the laser light, and the surface on which the laser light is emitted has a grating angle for changing the path of the laser light. do.

The grating structure of the lens can be variously manufactured according to the design.

Next, the second lens 53 is supported on the first surface of the member 50 and receives the light incident from the green laser light source 51b and the light reflected from the first mirror 55. Diffract to plane.

The second lens 53 has the same grating structure as that of the first lens 52, but a beam splitter which totally reflects the red wavelength and transmits the green wavelength to the surface where the light reflected from the first mirror 55 is incident ) Is installed.

In addition, the third lens 54 is supported on the first surface of the member 50 and receives the light incident from the blue laser light source 51c and the light reflected from the second mirror 56 as the second member of the member 50. Diffract to plane.

The third lens 54 has the same grating structure as the first lens 52, but a beam splitter for reflecting the red and green wavelengths and transmitting the blue wavelengths to the surface where the light reflected from the second mirror 56 is incident The difference is that it is installed.

Next, the first mirror 55 is supported on the second surface of the member 50 and reflects the light diffracted from the first lens 52.

The second mirror 56 is supported on the second surface of the member 50 and reflects the light diffracted from the second lens 53.

Next, the third mirror 57 is supported on the second surface of the member 50 and reflects the light diffracted from the third lens 54.

The diffractive lens 58 is supported on the first surface of the member 50 and diffracts the light diffracted from the third mirror 57.

Here, the diffractive lens 58 may use a circular diffraction optical element or the like.

Subsequently, the scan mirror 59 is supported on the second surface of the member 50 and scans the light diffracted from the diffraction lens 58 according to an external control signal.

Here, the scan mirror 59 uses a galvano mirror that scans incident light in two dimensions.

In some cases, the scan mirror 59 may use two scan mirrors.

That is, the two scan mirrors may be galvano mirrors for scanning incident light in left and right directions, and galvano mirrors for scanning incident light in up and down directions.

On the other hand, the first surface and the second surface of the light transmitting member 50 are formed to face each other, the first, second, third lenses 52, 53, 54, the first, second, third mirror ( 55, 56, 57, the diffraction lens 58, and the scan mirror 59 are preferably manufactured in a flat plate type.

The first, second, third lenses 52, 53, 54, and diffractive lenses 58 are supported on the first surface of the light transmissive member 50 and arranged in parallel with each other. The second mirrors 55, 56, 57 and the scan mirror 59 may be supported on the second surface of the light transmissive member 50 and arranged in line with each other.

In addition, on the first, second and third lenses 52, 53, 54, the diffractive lens 58 and the second surface of the light transmissive member 50 supported on the first face of the light transmissive member 50. The first, second, and third mirrors 55, 56, 57 and scan mirror 59 supported may be arranged to be offset from each other by a predetermined angle.

This is because the light transmission path can be minimized.

In order to optimize the configuration of the optical system of the present invention, optical elements having a driving circuit are disposed on the first surface of the light transmissive member 50, and a drive circuit is not provided on the second surface of the light transmissive member 50. It is desirable to arrange optical elements that do not.

The reason for this is that if the components that require circuit configuration are configured on one side, the spatial utilization is useful, which further reduces the size of the optical system.

Thus, the operation method of the portable projector according to the present invention configured as follows.

As shown in FIG. 3, first, a light source 51 composed of a red laser light source 51a, a green laser light source 51b, and a blue laser light source 51c is a light transmitting member (member) according to an external image signal. Light is emitted to the first side of 50).

Light emitted from the red laser light source 51a is respectively incident on the first lens 52 supported on the first surface of the light transmissive member 50.

Subsequently, the first lens 52 diffracts the incident light and exits the first lens 55 formed on the second surface of the light transmissive member 50.

The first mirror 55 reflects the light diffracted from the first lens 52 to the second lens 53 formed on the first surface of the light transmitting member 50.

On the other hand, the light emitted from the green laser light source 51b is incident on the second lens 53 supported on the first surface of the light transmissive member 50.

Since a beam splitter for total reflection of the red wavelength and transmission of the green wavelength is formed below the second lens 53, the second lens 53 includes the green light incident from the green laser light source 51b and the first mirror 55. The red light reflected from the light is diffracted to the second mirror 56 formed on the second surface of the member 50.

Next, the second mirror 56 reflects the light diffracted from the second lens 53 to the third lens 54 formed on the first surface of the light transmissive member 50.

On the other hand, the light emitted from the blue laser light source 51c is incident on the third lens 54 supported on the first surface of the light transmissive member 50.

Since the beam splitter which totally reflects the red and green wavelengths and transmits the blue wavelengths is formed below the third lens 54, the third lens 54 includes the blue light incident from the blue laser light source 51c and the second mirror ( The red and green light reflected from 56 is diffracted by the diffractive lens 58 formed on the second surface of the member 50.

Next, the red light, green light, and blue light diffracted by the diffractive lens 58 are incident on the scan mirror 59, and the scan mirror 59 scans the incident light and emits the light to an external screen.

The portable projector according to the present invention operated in this way not only stabilizes the arrangement of the optical elements, but also reduces the length of the optical path by transmitting light through the light transmissive member, thereby miniaturizing and reducing the weight.

5A and 5B are schematic views showing a mobile laser projector phone to which a portable projector according to the present invention is applied, and can be easily applied even in an environment having a small space such as a mobile phone.

As described above, the portable projector according to the present invention can stabilize the arrangement of the optical elements by disposing the optical elements on both sides of the light transmissive member, and can reduce the length of the optical path by transmitting the light through the light transmissive member.

In addition, the present invention may obtain high efficiency and brightness by synthesizing the laser lights of the red, green, and blue laser light sources into one optical axis.

Therefore, the projector of the present invention can be miniaturized and lightened, and can be applied to portable devices such as a mobile phone, and various applications can be made as necessary, so that an application field is wide.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

Claims (12)

Light transmissive member; A light source that emits light to a first surface of the member according to an external image signal to be transmitted into the member, and includes a red laser light source, a green laser light source, and a blue laser light source; A first lens supported on the first surface of the member and diffracting light incident from the red laser light source to the second surface of the member; A first mirror supported on the second surface of the member and reflecting light diffracted from the first lens; A second lens supported on the first surface of the member and diffracting light incident from the green laser light source and light reflected from the first mirror onto the second surface of the member; A second mirror supported on the second surface of the member and reflecting light diffracted from the second lens; A third lens supported on the first surface of the member and diffracting the light incident from the blue laser light source and the light reflected from the second mirror onto the second surface of the member; A third mirror supported on the second surface of the member and reflecting light diffracted from the third lens; A diffractive lens supported on the first surface of the member and diffracting the light reflected from the third mirror; And, And a scan mirror supported on the second surface of the member and configured to scan light diffracted from the diffractive lens according to an external control signal. A portable projector according to claim 1, wherein said light transmissive member is a hollow type member which is glass, plastic, air or vacuum inside. A portable projector according to claim 1, wherein said light transmissive member has a linear and flat surface. According to claim 1, wherein the area of the entire surface of the light transmitting member, the first, second, third lens, the first, second, third mirror, diffraction lens, the scan mirror is supported projection surface (projection) Or hollowed out. A portable projector according to claim 1, wherein the first side and the second side of the light transmissive member face each other. The portable projector of claim 1, wherein the red, green, and blue laser light sources are arranged side by side. The optical projector of claim 1, wherein the first, second, third lens, first, second, third mirror, diffractive lens, and scan mirror are of a flat plate type. system. The laser beam of claim 1, wherein the first, second, and third lenses have a grating angle at which the laser light is incident, a grating angle that converges the laser light, and a surface at which the laser light is emitted. A diffraction optical element having a grating angle that changes the path of the light. The portable projector according to claim 1, wherein the second lens is a beam splitter which totally reflects a red wavelength and transmits a green wavelength to a surface on which light reflected from the first mirror is incident. The portable projector according to claim 1, wherein the third lens is a beam splitter which totally reflects red and green wavelengths and transmits blue wavelengths to a surface on which the light reflected from the second mirror is incident. The portable projector of claim 1, wherein the scan mirror is a galvano mirror that scans incident light in two dimensions. 2. The apparatus of claim 1, wherein the first, second and third lenses, the diffractive lens supported on the first surface of the light transmissive member, and the first, second, and second supported on the second surface of the light transmissive member. And the third mirror and the scan mirror are arranged to be offset from each other by a predetermined angle.

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