KR101306705B1 - Image apparatus using light source of laser - Google Patents

Image apparatus using light source of laser Download PDF

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KR101306705B1
KR101306705B1 KR1020060006369A KR20060006369A KR101306705B1 KR 101306705 B1 KR101306705 B1 KR 101306705B1 KR 1020060006369 A KR1020060006369 A KR 1020060006369A KR 20060006369 A KR20060006369 A KR 20060006369A KR 101306705 B1 KR101306705 B1 KR 101306705B1
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South Korea
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light source
reflector
laser light
partial reflector
internal
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KR1020060006369A
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Korean (ko)
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KR20070076896A (en
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이상연
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엘지전자 주식회사
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00Investigating fluid-tightness of structures
    • G01M3/02Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/04Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
    • G01M3/16Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00Sampling; Preparing specimens for investigation
    • G01N1/02Devices for withdrawing samples
    • G01N1/22Devices for withdrawing samples in the gaseous state
    • G01N1/24Suction devices

Abstract

Disclosed is an imaging apparatus using a laser light source. The apparatus is characterized by comprising a laser light source, a partial reflector reflecting part of the light emitted from the laser light source, and a regression reflector reflecting light transmitted through the partial reflector and returning to the partial reflector. Therefore, the coherence characteristic of the laser light source can be effectively reduced both temporally and spatially, and thus, such as laser spots can be removed from the screen without causing any flickering or deterioration of screen brightness. It has the effect of allowing clear images to be seen and eliminating the need for optical fibers.
Laser Light Source, Multiple Random Phase Plates (MRPP)

Description

Image apparatus using light source of laser

1 is a schematic appearance of an embodiment of an imaging apparatus using a laser light source according to the present invention.

2 is a schematic appearance of another embodiment of an imaging apparatus using a laser light source according to the present invention.

3 is a diagram illustrating a schematic appearance of still another embodiment of an imaging apparatus according to the present invention.

4 is a view showing a three-dimensional appearance of the reflective frame shown in FIG.

5 is a view showing the appearance of an embodiment of the present invention of the multiple random phase plate shown in FIG. 1, 2 or 3;

FIG. 6 is a diagram illustrating a detailed and exemplary pattern according to the present invention of each sector shown in FIG. 5.

7 is a cross-sectional view of the present invention of multiple random phase plates.

1999 IEEE, "Speckle in Laser Imagery: Efficient Methods of Quantification and Minimization", R.J. Martinsen, K. Kennedy and A. Radl, pp. 354-355

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the use of laser light sources, and more particularly to an imaging apparatus for processing an image using a laser light source.

Recently, with the rapid development of the display field, consumers want to see brighter and clearer images on a larger screen. As one means for satisfying the needs of consumers, the development of displays using lasers is actively progressing.

However, due to the temporal and spatial coherency of the laser light source, when the image using the laser light source is diffused on the screen, laser spots, which are bright and dark interference fringes, are generated in the human eye. Therefore, due to this phenomenon, the user cannot see the original image clearly.

Among various conventional methods for removing such laser spots, in 1999, the IEEE titled "Speckle in Laser Imagery: Efficient Methods of Quantification and Minimization". Martinsen ',' K. Kennedy 'and' A. There is a method disclosed on pages 354-355 of the paper published by Radl '.

The disclosed conventional method attempts to produce multiple spot patterns or improve laser spots using diffractive optical elements by moving the viewing screen or optical fiber with vibrations using time averages. However, the above-described conventional methods have problems such as flickering of a screen or deterioration of brightness.

An object of the present invention is to provide an imaging apparatus using a laser light source for removing a phenomenon such as laser spots caused by the coherence of the laser light source.

The imaging apparatus using the laser light source according to the present invention for achieving the above object is a partial reflection by reflecting a laser light source, a partial reflector for reflecting a portion of the light emitted from the laser light source and the light transmitted through the partial reflector It is preferable that it is comprised with the regression reflection part which returns to negative.

Hereinafter, the configuration and operation of an imaging apparatus using a laser light source according to the present invention will be described with reference to the accompanying drawings.

1 is a schematic appearance of an embodiment of an imaging apparatus using a laser light source according to the present invention, which includes a laser light source 10, a partial reflector 12, a regression reflector 14, a display unit 16, and a screen ( 18).

The laser light source 10 shown in FIG. 1 emits laser light and sends it to the partial reflector 12. At this time, the partial reflector 12 reflects a part of the light emitted from the laser light source 10 and provides it to the display unit 16 in the direction of the arrow 11 or transmits it to the regression reflector 14. Here, the transmittance of the partial reflector 12 can be adjusted, and the partial reflector 12 is coded to transmit only a portion of the light emitted from the laser light source 10 to the regression reflector 14.

At this time, the retroreflective portion 14 reflects the light transmitted through the partial reflective portion 12 and returns to the partial reflective portion 12. According to the present invention, a part of the light returned from the retroreflective portion 14 passes through the partial reflective portion 12 and proceeds to the display portion 16. However, the remaining part may not penetrate the partial reflector 12 and proceed to the display unit 16, and may return to the partial reflector 12 through the regression reflector 14. As such, since the light that has not passed through the partial reflector 12 repeats the process of being returned, the light passing through the partial reflector 12 and exiting to the display unit 16 is composed of beams oscillated at different times. Therefore, the temporal coherence is different from the beam originally emitted from the laser light source 10.

To this end, the retroreflective unit 14 may be implemented as a series of internal reflectors that continuously reflect light passing through the partial reflector 12 from the laser light source 10 and return to the partial reflector 12. . Here, the series of internal reflectors may be implemented as a mirror. At this time, the first internal reflector 20 of the series of internal reflectors 20, 22, and 24 is reflected by the light or partial reflector 12 transmitted from the laser light source 10 to the partial reflector 12. The reflected light is sent to the second internal reflector 22. At this time, the second internal reflector 22 reflects the light reflected from the first internal reflector 20 to the third internal reflector 24. The third internal reflector 24 receives the light reflected from the second internal reflector 22 and reflects the light to the partial reflector 12. According to the present invention, the first, second and third internal reflection parts 20, 22, and 24 may be arranged in a rectangular shape as shown in FIG. 1, but the present invention is not limited thereto. For example, the series of internal reflectors may have various other polygonal shapes that can return the light transmitted through the partial reflector 12 or the light reflected from the partial reflector 12 back to the partial reflector 12. Can be deployed.

As described above, the light emitted from the laser light source 10 and transmitted through the partial reflector 12 proceeds while the phase is continuously changed while being reflected by the retroreflective portion 14 and returns back to the partial reflector 12. Done.

According to the present invention, each of the series of internal reflectors may be embodied as a totally reflective mirror that completely reflects light.

Moreover, it is preferable to lengthen the path | route which light returns in the return reflection part 14. As shown in FIG. This is because the longer the optical path, the longer the optical path difference, thereby reducing the temporal coherence.

2 is a schematic appearance of another embodiment of an imaging apparatus using a laser light source according to the present invention, which includes a laser light source 10, a multi random phase plate (MRPP) 30, and a collimator 32. ), A partial reflector 12, a regression reflector 14, and a focusing lens 34.

The laser light source 10, the partial reflector 12, and the regression reflector 14 of the imaging apparatus illustrated in FIG. 2 may include the laser light source 10, the partial reflector 12, and the regression reflector illustrated in FIG. 1. The same reference numerals are used because they play the same role as 14), and detailed description thereof is omitted. In FIG. 2, the partial reflector 12 is implemented with first, second and third internal reflectors 20, 22 and 24, as shown in FIG. 1.

The focusing lens 34 shown in FIG. 2 focuses the light from the partial reflector 12 and sends the focused light to the display unit 16 shown in FIG. 1 through the output terminal OUT. The display unit 16 serves to project an image corresponding to the light focused by the focusing lens 34 onto the screen 18.

The multiple random phase plates 30 shown in FIG. 2 enlarge the diameter of the beam emitted from the laser light source 10 and send the beam having the enlarged diameter to the collimator 32. That is, beams emitted from the laser light source 10 have different phase differences while passing through the multiple random phase plates 30. Here, the multiple random phase plate 30 serves to remove spatial coherence of the beam emitted from the laser light source 10.

At this time, the collimator 32 converts the light coming from the multiple random phase plate 30 into straight light, and sends the converted straight light to the partial reflector 12. That is, the beams coming from the multiple random phase plates 30 having different phase differences are converted into the form of straight light having a constant area while passing through the collimator 32. As such, the multiple random phase plate 30 serves to determine the diameter of the light emitted from the laser light source 10, the collimator 32 is a partial reflector 12 in the light from the multiple random phase plate 30 It also plays a role in determining the width of light to be sent to.

According to the present invention, at least one incident surface of the multiple random phase plates 30 and the collimator 32 may be provided with anti-reflective films (ARs) 31 and 33 for preventing the reflection of light.

In the conventional case, unlike in FIG. 2, light traveled through the optical fiber from the laser light source 10 to the focusing lens 34. However, since the imaging apparatus according to the present invention shown in FIG. 2 can send light from the laser light source 10 to the focusing lens 34 without using the optical fiber, the use of the optical fiber can be minimized.

3 is a view showing a schematic appearance of another embodiment of an imaging apparatus according to the present invention, which includes a laser light source 10, a multiple random phase plate (MRPP) 30, a collimator 32, and a partial reflector 40. , Revolving reflectors 42, 44, and 46 and focusing lens 34.

Components that play the same role in the imaging apparatus illustrated in FIG. 3 and the imaging apparatus illustrated in FIG. 2 have the same reference numerals, and a detailed description thereof will be omitted. In this case, the partial reflector 40 shown in FIG. 3 performs the same role as that of the partial reflector 12 shown in FIG. Is different from the regression reflector 14 shown in FIG. 1 or 2, but performs the same role.

The partial reflector 40 shown in FIG. 3 reflects a portion of the light emitted from the laser light source 10 and passed through the multiple random phase plates 30 and the collimator 32 to the focusing lens 34 and the rest of the light is reflected. Transmits toward the regression reflectors 42, 44, and 46. In the regression reflectors 42, 44, and 46, the first internal reflector 42 reflects the light reflected from the partial reflector 40 and sends it to the second internal reflector 44. The second internal reflector 44 receives light reflected from the first internal reflector 42 and reflects the light to the third internal reflector 46. The third internal reflection portion 46 reflects the light reflected by the second internal reflection portion 44 and sends it to the partial reflection portion 40.

To this end, the retroreflective parts 42, 44 and 46 reflect the light emitted from the laser light source 10 and transmitted through the partial reflector 40 to return back to the partial reflector 40, as shown in FIG. 3. As shown, it may be implemented as a reflective frame 50 having a structure.

FIG. 4 is a view showing a three-dimensional appearance of the reflective frame 50 shown in FIG. 3, and is composed of a reflective frame 60.

The reflecting frame 50 shown in FIG. 3 may be integrated as shown in FIG. 4 and implemented in the form of a three-dimensional frame 60. If the inner reflectors 20, 22 and 24 are provided separately as shown in FIG. 1 or FIG. 2, it is desirable to properly align the inner reflectors 20, 22 and 24 for accurate reflection. . However, when the internal reflectors 42, 44, and 46 are integrated as the reflecting frame 50 or 60 as shown in FIG. 3 or 4, the internal reflectors 42, 44, and 46 are separately aligned. There is no need to do it.

5 is a view showing the appearance of an embodiment of the present invention of the multiple random phase plate 30 shown in FIG. 1, 2 or 3, which is implemented with a plurality of sectors 70.

FIG. 6 is a view illustrating a detailed and exemplary pattern of each sector shown in FIG. 5 according to the present invention, and includes first pattern portions 80 and second pattern portions 82. Letters written in the second pattern portion 82, that is, 2, 3.4, ..., etc., mean size.

As shown in FIG. 5, the multiple random phase plates 30 are implemented with multiple sectors 70. At this time, each sector 70 has first and second pattern portions 80 and 82, as shown in FIG. 6. Here, the sizes of the second pattern parts 82 are different from each other.

The first pattern portion 80 transmits a beam emitted from the laser light source 10 and has a first refractive index. The second pattern portion 82 transmits a beam emitted from the laser light source 10 and has a second refractive index. As such, the first pattern portion 80 and the second pattern portion 82 have different refractive indices. Therefore, the beams passing through the first pattern portion 80 and the beams passing through the second pattern portion 82 have optical paths to each other, thereby causing an optical path difference.

At this time, it is preferable that the largest size among the sizes of the second pattern portions 82 is smaller than the size of the imager. Here, the imager serves to image an image and is included in the display unit 16 shown in FIG. 1. This is because when the size of the second pattern portion 82 is larger than the size of the imager, laser spots may occur due to coherence in time. For example, in the case of a digital lighting processor (DLP), since the mirror size of an imager such as a digital micromirror device (DMD) is 14 µm, the largest size in the second pattern portion 82 is achieved. The size is preferably smaller than this.

The size of the second pattern portion 82 shown in FIG. 6 may be set differently depending on the type of beam incident from the laser light source 10, that is, whether the beam is a blue beam, a red beam, or a green beam.

7 is a cross-sectional view of the multiple random phase plate 30 according to the present invention, which is composed of a glass plate 90 and a thin film 92. Here, reference numeral 94 denotes an RPP pattern, 96 denotes an interface of the glass plate 90, and 98 denotes a state where the beam is incident.

The glass plate 90, which is a single material, has a first refractive index and corresponds to the first pattern portion 80 illustrated in FIG. 6. The thin film 92 is stacked on the glass plate 90 in an iron shape, has a second refractive index, and corresponds to the second pattern portion 82 illustrated in FIG. 6. Thin film 92 may be implemented in, for example, silicon oxide, silicon dioxide (S i 0 2). As such, by coating the thin film 92 on the glass plate 90, the beam may pass through different materials 90 and 92.

In this case, when the second pattern portion 82 has a convex shape, as shown in FIG. 7, the convex width t may be expressed by Equation 1 below.

Figure 112006004542599-pat00001

Here, λ represents the wavelength of the laser beam, n represents the second refractive index through which the beam passes, and t represents the width that makes the phase difference by π.

Unlike in FIG. 2, the imaging apparatus according to the present invention may not provide the multiple random phase plates 30 and the collimator 32 as shown in FIG. 1.

Alternatively, the imaging apparatus according to the present invention may provide only the collimator 32 without providing the multiple random phase plates 30, as shown in FIG. 2. In this case, the collimator 32 converts the light emitted from the laser light source 10 into straight light, and sends the converted straight light to the partial reflector 12.

As described above, the imaging apparatus using the laser light source according to the present invention can effectively reduce the coherence, which is a unique characteristic of the laser light source, in time and space, so as not to cause blurring of the screen or deterioration of brightness. Phenomenon, such as laser spots, can be removed from the screen, resulting in a clear and clear image and eliminating the need for optical fibers.

Claims (17)

  1. Laser light source;
    A partial reflector reflecting a part of light emitted from the laser light source;
    A regression reflector which reflects the light transmitted through the partial reflector and returns to the partial reflector;
    A collimator for outputting light emitted from the laser light source to the partial reflector;
    A multiple random phase plate positioned between the laser light source and the collimator to remove spatial coherence of the beam emitted from the laser light source;
    A focusing lens for focusing light emitted from the partial reflector; And
    And a display unit for projecting an image corresponding to the light focused by the focusing lens onto a screen.
  2. The apparatus of claim 1, wherein a part of the returned light passes through the partial reflector, and a part of the returned light is reflected by the partial reflector and returns to the regression reflector.
  3. delete
  4. delete
  5. delete
  6. The method of claim 1, wherein the incident surface of at least one of the multiple random phase plate and the collimator is
    And an anti-reflection film for preventing reflection of the light.
  7. The method of claim 1, wherein the regression reflector
    And a series of internal reflectors for continuously reflecting the light transmitted through the partial reflector to return to the partial reflector.
  8. The method of claim 7, wherein the series of internal reflectors are
    A first internal reflector reflecting light passing through the partial reflector;
    A second internal reflector reflecting light reflected from the first internal reflector; And
    A third internal reflector for reflecting light reflected from the second internal reflector to the partial reflector;
    And the first, second and third internal reflectors are arranged in a rectangular shape.
  9. The apparatus of claim 7 or 8, wherein each of the series of internal reflection parts completely reflects the light.
  10. The method of claim 1, wherein the regression reflector
    And a reflecting frame reflecting light transmitted through the partial reflecting unit, returning to the partial reflecting unit, and having a standardized structure.
  11. The imaging apparatus using a laser light source according to claim 1, wherein the transmittance of the partial reflector is adjustable.
  12. The method of claim 1, wherein the multiple random phase plate is
    At least one first pattern portion transmitting a beam emitted from the laser light source and having a first refractive index; And
    And at least one second pattern portion having a second refractive index and transmitting a beam emitted from the laser light source.
  13. The image using the laser light source according to claim 12, wherein the image device including an imager for imaging an image has the largest size among the first and second pattern portions being smaller than the size of the imager. Device.
  14. The imaging apparatus of claim 12, wherein the x-th (where x is 1 or 2) pattern portion has a convex shape, and the convex width t is expressed as follows.
    Figure 112006004542599-pat00002
    (Where λ represents the wavelength of the beam and n represents the x-th refractive index through which the beam passes).
  15. The method of claim 12, wherein the multiple random phase plate is
    A glass plate having the first refractive index; And
    A thin film laminated on the glass plate in an iron shape and having the second refractive index,
    The glass plate corresponds to the first pattern portion, and the thin film corresponds to the second pattern portion.
  16. The imaging apparatus of claim 15, wherein the thin film is a silicon oxide film.
  17. The imaging apparatus according to claim 12, wherein the size of at least one of the first and second pattern parts is set differently according to the type of beam incident from the laser light source.
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KR100803222B1 (en) * 2007-01-26 2008-02-14 삼성전자주식회사 Speckle reduction laser and laser display apparatus employing the same

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09288251A (en) * 1996-02-22 1997-11-04 Nikon Corp Pulse width lengthening optical system and exposure device provided therewith
KR20040062978A (en) * 2001-11-30 2004-07-09 하마마츠 포토닉스 가부시키가이샤 Hologram preparing method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09288251A (en) * 1996-02-22 1997-11-04 Nikon Corp Pulse width lengthening optical system and exposure device provided therewith
KR20040062978A (en) * 2001-11-30 2004-07-09 하마마츠 포토닉스 가부시키가이샤 Hologram preparing method

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