GB2337134A - Projector for LCD with lens supporting arm - Google Patents

Projector for LCD with lens supporting arm Download PDF

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Publication number
GB2337134A
GB2337134A GB9809646A GB9809646A GB2337134A GB 2337134 A GB2337134 A GB 2337134A GB 9809646 A GB9809646 A GB 9809646A GB 9809646 A GB9809646 A GB 9809646A GB 2337134 A GB2337134 A GB 2337134A
Authority
GB
United Kingdom
Prior art keywords
panel
housing
light beam
projecting device
lcd
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB9809646A
Other versions
GB9809646D0 (en
Inventor
Chin-Mao Chen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SUNFLOWER SYSTEMS Inc
Original Assignee
SUNFLOWER SYSTEMS Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SUNFLOWER SYSTEMS Inc filed Critical SUNFLOWER SYSTEMS Inc
Priority to GB9809646A priority Critical patent/GB2337134A/en
Publication of GB9809646D0 publication Critical patent/GB9809646D0/en
Publication of GB2337134A publication Critical patent/GB2337134A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/02—Viewing or reading apparatus
    • G02B27/04—Viewing or reading apparatus having collapsible parts
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/16—Optical objectives specially designed for the purposes specified below for use in conjunction with image converters or intensifiers, or for use with projectors, e.g. objectives for projection TV
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B17/00—Systems with reflecting surfaces, with or without refracting elements
    • G02B17/02—Catoptric systems, e.g. image erecting and reversing system
    • G02B17/04—Catoptric systems, e.g. image erecting and reversing system using prisms only
    • G02B17/045—Catoptric systems, e.g. image erecting and reversing system using prisms only having static image erecting or reversing properties only
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/005—Projectors using an electronic spatial light modulator but not peculiar thereto
    • G03B21/006—Projectors using an electronic spatial light modulator but not peculiar thereto using LCD's
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/147—Optical correction of image distortions, e.g. keystone
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/16—Cooling; Preventing overheating
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor
    • H04N5/7416—Projection arrangements for image reproduction, e.g. using eidophor involving the use of a spatial light modulator, e.g. a light valve, controlled by a video signal
    • H04N5/7441—Projection arrangements for image reproduction, e.g. using eidophor involving the use of a spatial light modulator, e.g. a light valve, controlled by a video signal the modulator being an array of liquid crystal cells
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Projection Apparatus (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)
  • Overhead Projectors And Projection Screens (AREA)
  • Liquid Crystal (AREA)

Abstract

A projecting device for projecting a pattern produced by an LCD 73 of a notebook computer set 7 to a screen 9 includes a housing 2, a light beam source 3, a lens-supporting arm 4 and a projection lens unit 5. The housing 2 has a transparent panel 21 that is adapted to mount the LCD 73. The light beam source 3 is mounted inside the housing 2. The lens-supporting arm 4 extends from the housing 2 away from the panel 21 in the direction of the light beam. The projection lens unit 5 is mounted on the lens-supporting arm 4 and is disposed across a straight line which extends between the panel 21 to the screen 9. The projection lens unit 5 includes a lens assembly (51, Fig 8) for producing an image from the light beam, and a light-transmissive image rotating unit (52, Fig 8) for rotating the image by a predetermined angle. The device may have support rods (8, 8', Fig 7) to allow tilting. Heat dissapating devices (6, 31, Fig 2) may be used.

Description

1 PROJECTION DEVICE 2337134 This invention relates to a projection.
device, more particularly to a projection devi.ce for projecting a pattern produced in an LCD of a portable computer set to a substantially vertical screen.
U. S. Patent Nos. 5, 359, 550 and 5, 041, 965 disclose a notebook computer set for use with overhead projectors. In U.S. Patent No. 5,359,550, the notebook computer set has a notebook computer pivotally connected to a liquid crystal display (LCD) that is connected detachably to a cover. The notebook computer set also has a bracket attached to the housing is of the projector, and suction devices attached to the panel of the projector for carrying the notebook computer set so that the LCD is disposed over the panel of the projector. In this instance, a C-shaped heat -dissipating member may be clamped on the LCD in order to dissipate the heat of the light beam source of the projector to the LCD.
The aforementioned conventional projecting arrangement suffer from the following disadvantages:
1. Since the notebook computer set simply rests on the bracket and the suction device, the notebook computer set is liable to drop from the projector when the notebook computer set or the projector is 1 1 1 2 is unintentionally subjected to impact.
2. In use, the projector screen will be obscured by the lens-supporting arm of the projector.
3. Since the suction devices separate the LCD from the panel of the projector, a relatively large gap is produced between the LC1) and the panel of the projector. The light beam emitted from the housing of the projector will leak from the gap, thereby resulting in discomfort to the eyes of the audience.
4. Because of the gap between the LCD and the panel of the proj ector, f ocusing adj ustment of the proj ector is difficult to conduct.
The object of the present invention is to provide a projecting device.that can overcome or ameliorate one or more,)lbf..the disadvantages commonly associated with the aforementioned prior art.
According to the present invention, a projecting device for projecting a pattern produced in an LCD of a notebook computer set to a substantially vertical screen comprises a housing, a light beam source, a substantially horizontal lens-supporting arm and a projection lens unit. The housing has a transparent panel that is adapted to mount the LCD and to face the screen. The light beam source is mounted inside the housing for generating a light beam to pass through the transparent panel. The lens- supporting arm extends from the housing away from the panel in the 3 is direction of the light beam. The projection lens unit is mounted on the lens-supporting arm and is disposed across a straight line which extends between the panel to the screen to project the light beam to the screen substantially in the same direction as that of the light beam. The projection lens unit includes a lens assembly for producing an image from the light beam and a light-transmissive image rotating unit for rotating the image by a predetermined angle.
Other features and advantages of the present invention will become apparent in the following detailed description of the preferred embodiments of the invention, with reference to the accompanying drawings, in which:
Figure 1 is a perspective view of a preferred embodiment of a projecting device according to the present invention; Figure 2 is an exploded view of the preferred embodiment of the projecting device according to the present invention; Figure 3 is a schematic view illustrating the preferred embodiment of the projecting device when used cooperatively with a notebook computer set; Figure 4 is a schematic view illustrating the preferred embodiment of the projecting device when used cooperatively with another type of notebook computer set; 4 is I Figure 5 is a schematic view illustrating how the preferred embodiment of the projecting device is used; Figure 6 is a top view of the preferred embodiment of the projecting device in which a lenssupporting arm is folded; Figure 7 is a schematic view of another preferred embodiment of the projecting device according to the present invention; and Figure 8 is a schematic view illustrating a lens assembly and a light - transmissive image rotating unit of a projection lens unit of the projecting device according to the present invention.
Referring to Figures 1, 2 and 3, a preferred embodiment of a projecting device for projecting a pattern produced by an LCD 73 of a notebook computer set 7 to a substantially vertical screen 9 according to the present invention is shown to comprise a housing 2, a light beam source 3, a substantially horizontal lens-supporting arm 4, a projection lens unit 5 and a heat-dissipating device 6.
The housing 2 has a rectangular panel 21 that faces the screen 9. A retaining member 22 is connected adjacent to an upper edge of the panel 21.
The light beam source 3 is disposed in the housing 2. A heat -dissipating unit 31 is mounted adjacent to the light beam source 3.
1 5 is The lens-supporting arm 4 is substantially perpendicular to the screen 9 and has an end connected pivotally to the housing 2. The lens-support arm 4 extends away from the panel 21 in the direction of the light beam.
The projection lens unit 5 is mounted slidably to the lens-supporting arm 4 for moving away from and toward the panel 21. The projection lens unit 5 is disposed across a straight line which extends between the panel 21 to the screen 9 to project the light beam to the screen 9 substantially in the same direction as that of the light beam. The projection lens unit 5 includes a lens assembly 51 for producing an image from the light beam, and a light-transmissive image rotating unit 52 for rotating the image by a predetermined angle, as best illustrated in Figure 8. Preferably, the image rotating unit 52 includes a prism set. The focus of the projection lens unit 5 is adjustable.
The heat -dissipating device 6 is connected adjacent to the panel 21 of the housing 2, and has an air-guide conduit 61 for directing air to the panel 21.
Referring to Figure 3, the notebook computer set 7 includes a notebook computer 72 and the liquid crystal display (LCD) 73 which is connected pivotally to the notebook computer 72 and which is enclosed by a frame 71. The LCD 73 is pivoted 90 degrees relative E i 6 to the notebook computer 72 and is disposed in front of the panel 21 of the housing 2. The retaining member 22 presses the frame 71 of the notebook computer set 7 to maintain a constant distance between the LCD 73 and the panel 21.
Referring to Figure 4, the projecting device of the present invention can be used with another type of notebook computer set 71 The notebook computer set 71 includes a notebook computer 72' and a liquid crystal display (LCD) 73' that is connected detachably to the notebook computer 721 and that is enclosed by a frame 711. The LCD 731 is disposed in front of the panel 21 of the housing 2. A positioning bracket 23 is disposed in front of the panel 21 adjacent to a lower edge of the panel 21. The frame 711 is supported on the positioning bracket 23 in order to hold the LCD 731 in place. At this time, the retaining member 22 holds the frame 711. Therefore, a constant distance between the LCD 731 and the panel 21 can be maintained.
In use, the panel 21, the LCD 73 (73') and the screen 9 are parallel substantially to one another while the light beam emitted from the light beam source 3 is perpendicular substantially to the panel 21, the LCD 73 (73 1) and the screen 9. The lens-supporting arm 4 is also parallel substantially with the light beam emitted from the light beam source 3. The projection lens unit 5 is slidable on the lens-supporting arm 4 is 7 is so as to adjust the position thereof relative to the panel 21. The focus of the projection lens unit 5 is adjustable in order to result in a proper focus on the screen 9, as best illustrated in Figure 5.
Referring to Figure 6, the lens-supporting arm 4 is folded to a side face of the housing 2 so as to facilitate storage of the projecting device.
Figure 7 shows a modified preferred embodiment of the projecting device of this invention. Two pairs of support members 8, 81 are mounted to the bottom face of the housing 2. Each of the support members 8, 81 is formed as a threaded rod. By adjusting the relative heights of the support members 8, 8, the bottom face of the housing 2 can incline by a predetermined angle relative to a horizontal plane in order to permit proper projection of an image on the screen 9.
With the aforementioned structures, the projecting device of the present invention has the following advantages:
1. Since the notebook computer 72 can be disposed on a stable, fixed object which supports the housing 2 of the projecting device and which serves as a support base, the LCD 73 can be supported firmly in front of the'panel 21. In the case where the LC1) 73' is detachable from the notebook computer 72', the LCD 731 can be supported on the positioning bracket 23 in front of the panel 21. In addition, the frame 71(711) can 8 is be held with respect to the panel 21 by the retaining member 22, thereby resulting in further positioning of the LCD 73 (731). Therefore, the notebook computer set 7 (71) can be supported and positioned in front of the panel 21 of the projecting device without using the bracket of the aforementioned prior art.
2. A constant distance between the LCD 73 (73') and the panel 21 can be maintained. That is, the LCD 73 (731 is always disposed in front of the panel 21 in a substantially parallel relationship when the notebook computer set 7 (71) is used with the projecting device.
3. Since the lens-supporting arm 4 is parallel to the light beam, the lens-supporting arms 4 will not obscure the screen 9.
4. Since no bracket and suction devices are used, and since the heatdissipating device 6 is disposed adjacent to an edge of the panel 21 and blows air into the space between the LCD 73 (731) and the panel 21 via the air-guide conduit 61, no physical object is disposed between the LCD 73(731) and the panel 21. Therefore, the LCD 73(731) can be disposed in front of the panel 21 as close as possible, thereby resulting in minimum leakage of the light beam from a gap between the LCD 73(731) and the panel 21.
5. Since the light beam leakage problem is minimized, focusing adjustment can be conducted easily. In addition, the housing 2 can incline by an angle with 9 respect to the screen 9 by means of the support members 8, 81 so as to project properly the image onto the screen 9.
is

Claims (1)

  1. CLAIMS:
    1. A projecting device for projecting a pattern produced by an LCD of a notebook computer set to a substantially vertical screen, comprising: a housing having a transparent panel which is adapted to mount the LCD and to face the screen; a light beam source mounted inside said housing for generating a light beam to pass through said panel; a substantially horizontal lens-supporting arm which extends from said housing away from said panel in the direction of said light beam; and a projection lens unit mounted on said lenssupporting arm and disposed across a straight line which extends between said panel to the screen to project said light beam to the screen substantially in the same direction as that of said light beam, said projection lens unit including a lens assembly for producing an image from said light beam and a light-transmissive image rotating unit for rotating the image by a predetermined angle. 2. The projecting device as claimed in Claim 1, wherein said light -transimssive image rotating unit includes a prism set. 3. The projecting device as claimed in Claim 1, wherein said lens-supporting arm is connected pivotally to said housing for moving between an extended position and a folded position.
    1 1 4. The projecting device as claimed in Claim 3, wherein said housing has a side face connected substantially perpendicularly to said panel, said lens-supporting arm being foldable relative to said side face of said housing.
    5. The projecting device as claimed in Claim 1, wherein said. projection lens unit is mounted slidably to said lens-supporting arm for moving away from and towards said panel of said housing.
    6. The projecting device as claimed in Claim 1, wherein said panel of said housing has an upper edge, a lower edge and a retaining member disposed adjacent to said upper edge of said panel for holding the LCD of the notebook computer set closely adjacent to said panel in a substantially vertical position.
    7. The projecting device as claimed in Claim 6, wherein said panel of said housing further has a positioning bracket disposed adjacent to said lower edge of said housing for holding the LCD of the notebook computer set closely adjacent to said panel in a substantially vertical position.
    8. The projecting device as claimed in Claim 1, wherein said panel of said housing has an edge and a heatdissipating device disposed adjacent to said edge of said panel.
    9. The projecting device as claimed in Claim 8, wherein said heat dissipating device has an air-guide conduit 12 adapted to direct air to said panel.
    10. The projecting device as claimed in Claim 1, wherein said housing has a bottom face and at least one pair of support members extending downwardly f rom said bottom face of said housing, said support members having heights which are adjustable to place said bottom face in an inclined position of a predetermined angle relative to a horizontal plane.
    11. A projecting device substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
GB9809646A 1998-05-06 1998-05-06 Projector for LCD with lens supporting arm Withdrawn GB2337134A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9809646A GB2337134A (en) 1998-05-06 1998-05-06 Projector for LCD with lens supporting arm

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9809646A GB2337134A (en) 1998-05-06 1998-05-06 Projector for LCD with lens supporting arm

Publications (2)

Publication Number Publication Date
GB9809646D0 GB9809646D0 (en) 1998-07-01
GB2337134A true GB2337134A (en) 1999-11-10

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Family Applications (1)

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GB9809646A Withdrawn GB2337134A (en) 1998-05-06 1998-05-06 Projector for LCD with lens supporting arm

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GB (1) GB2337134A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220066300A1 (en) * 2019-05-22 2022-03-03 Hewlett-Packard Development Company, L.P. Projection unit and scanner accessories

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4051535A (en) * 1976-04-09 1977-09-27 Inglis James M Magnification of television images
US5392081A (en) * 1993-09-29 1995-02-21 Texas Instruments Incorporated Calculator projection display
WO1996012998A1 (en) * 1994-10-21 1996-05-02 Jan Batal Projection system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4051535A (en) * 1976-04-09 1977-09-27 Inglis James M Magnification of television images
US5392081A (en) * 1993-09-29 1995-02-21 Texas Instruments Incorporated Calculator projection display
WO1996012998A1 (en) * 1994-10-21 1996-05-02 Jan Batal Projection system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220066300A1 (en) * 2019-05-22 2022-03-03 Hewlett-Packard Development Company, L.P. Projection unit and scanner accessories

Also Published As

Publication number Publication date
GB9809646D0 (en) 1998-07-01

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)