JP5072042B2 - Imaging device with projection display function and portable imaging projector - Google Patents

Description

  The present invention relates to an imaging apparatus with a projection display function and a portable photographic projector that are mounted on a mobile phone or a digital camera and can project and display a captured image on a screen or the like.

  In recent years, a portable electronic device in which a camera module including an imaging lens and an image sensor used for a digital camera is incorporated in a portable electronic device such as a personal computer, an electronic notebook, or a cellular phone, and a photographing function is added in addition to the original function. Equipment is rapidly spreading. In particular, mobile phones with a camera are widely used, and image data of a photographed subject image is recorded in a flash memory or the like provided in the telephone body. By switching the operation mode of the mobile phone to a playback mode for displaying captured images, the captured images can be displayed on the liquid crystal monitor, and the captured images can be confirmed on the spot.

  However, since the liquid crystal monitor provided in the camera-equipped mobile phone is small, there is a problem that it is difficult to confirm an image. Also, since it cannot be shown to many people at once, it cannot be used for presentations. An example for solving this is shown in Patent Document 1 below. Here, there is described a camera module in which a light source and a liquid crystal light projector are provided next to an image sensor mounted on a conventional camera module, and has both an imaging function and a projection display function by sharing an optical lens. When the image sensor is disposed on the image plane of the optical lens, it functions as a camera, and when the LCD panel is disposed at the position of the image plane of the optical lens, it functions as a projector. By incorporating such a projection display function-integrated camera module into a mobile phone, the mobile phone can be used as a portable projector that can be held by hand. It can be used for presentations.

JP 2007-036843 A

  The camera module described in the above-mentioned patent document moves the substrate on which the image sensor and the liquid crystal panel are mounted, and arranges either the image sensor or the liquid crystal panel at the imaging point of the optical lens to switch between the imaging function and the projection function. Since a moving mechanism for moving the substrate is required, there is a concern that the image sensor or the liquid crystal panel may be displaced or inclined with respect to the optical axis due to the backlash of the moving mechanism. Furthermore, since the camera-equipped mobile phone is used while being held by hand, there is a concern that the above-described backlash may increase due to vibrations caused by hand shake or the like during carrying.

  The present invention has been made to solve the above-mentioned problem, and the switching mechanism for selecting the shooting function and the projection display function is simplified so that the switching mechanism is free of backlash, and the imaging with the projection display function is made to save the switching space. An object is to provide an apparatus.

An imaging apparatus with a projection display function according to the present invention has an imaging surface on which a subject image is formed by an optical lens, and outputs an object image formed on the imaging surface as an imaging signal; Storage means for storing image data based on an imaging signal and the image data read from the storage means are displayed, and illumination light emitted from a light source is used as image light corresponding to the image data. An image forming unit; a first position for guiding subject light emitted from the optical lens to the image sensor; and the image light emitted from the image forming unit to the optical lens to project the image light on a screen. and a reflecting member freely displaced in the second position to the reflecting member, the first for reflecting subject light emitted from the optical lens in the first position to the image sensor And a second reflecting surface that reflects the image light emitted from the image forming unit at the second position toward the optical lens, and is between the first position and the second position. It is characterized by being provided so as to be freely movable .

The first reflecting surface and the second reflecting surface are preferably formed at 90 ° with respect to each other, and arranged with an inclination of 45 ° with respect to the optical axis of the optical lens.

  The imaging apparatus with a projection display function includes an AF detection unit that detects a distance to a subject, and after the optical lens is focused by the AF detection unit, the reflecting member is displaced to the second position. It is good to make it. A portable photographic projector according to the present invention includes any one of the imaging devices with the projection display function.

  According to the present invention, it is possible to provide an imaging device with a projection display function and a portable imaging projector capable of switching between a shooting function and a projection display function which are simplified in configuration and free of backlash and save switching space. it can.

1 is a perspective external view of a digital camera according to the present invention as viewed from the front. It is the perspective appearance figure which looked at the digital camera by the present invention from the back. It is a figure which shows the structure in which the 1st optical path of the imaging device with a projection display function by this invention was formed. It is a figure which shows the structure in which the 2nd optical path was formed. It is a figure which shows the electrical constitution of a digital camera. It is a schematic diagram explaining the effect | action of FIG. It is a schematic diagram explaining a modification. It is a schematic diagram explaining another embodiment.

  As shown in FIGS. 1 and 2, a digital camera (portable shooting projector) 10 having a shooting function and a projection display function is provided with an imaging projection lens (optical lens) on the front surface of a substantially rectangular parallelepiped camera body 11. 12, a strobe light emitting unit 13, and a viewfinder objective window 14. A power button 15, a shooting / projection switching button 16 for switching between a camera function (shooting mode) and a projector function (projection mode) and A shutter button 17 is provided. On the back of the camera body 11, an LCD display panel 18 for displaying a photographed image, a viewfinder eyepiece window 19, a photography / reproduction switching button 20 for switching between a photography mode and a reproduction mode, a zoom button 21 for zooming the imaging projection lens 12, and a reproduction In addition to the forward button 22 and the return button 23 for sending or returning the playback image in the mode, various operation buttons 24, 25, and 26 for performing shooting preparation, projection preparation, or operations related to the playback screen are provided. The feed button 22 and the return button 23 are focus adjustment buttons for manually focusing the projected image in the projection mode. Further, a slot (not shown) in which a memory card 27 in which image data is stored is detachably loaded is provided on the bottom surface of the camera body 11, and the captured image data is written and stored in the memory card 27. Is done.

  As shown in FIGS. 3 and 4, the digital camera 10 includes an imaging device 29 with a projection display function including the imaging projection lens 12 and an imaging projection unit 30 disposed behind the imaging lens 12. In the imaging projection unit 30, a mirror (reflecting member) 31 having a reflection surface 32 is rotatably supported on the optical axis of the imaging projection lens 12, and the mirror 31 distributes 90 degrees to the left and right with respect to the optical axis. On the other side, a CCD (image sensor) 33 is provided in which an imaging surface 34 on which a subject image is formed is directed toward the mirror 31, and an LCD panel on which a projected image is formed on the other side. 35, an image forming unit 38 including a polarizing plate 36 and a diffusion plate 37, and a light source lamp 39 for irradiating illumination light thereon. As shown in FIG. 3, when the shooting mode is selected by the shooting / projection switching button 16, the mirror 31 is rotated by the operation force of the shooting / projection switching button 16, and the reflecting surface 32 is inclined 45 ° toward the CCD 33. The first light path 41 is formed, which is the first position 31 a and the imaging light incident on the imaging projection lens 12 is reflected by the reflection surface 32 and forms an object image on the imaging surface 34 of the CCD 33. Also, as shown in FIG. 4, when the projection mode is selected by the shooting / projection switching button 16, the mirror 31 is in the second position 31b in which the reflecting surface 32 is inclined 45 ° toward the LCD panel 35, Illumination light from the light source lamp 39 passes through the LCD panel 35 and is reflected by the reflecting surface 32, passes through the imaging projection lens 12, and is formed on the LCD panel 35 on the front screen 69 (see FIG. 6). Is formed. The mirror 31 may be switched by a built-in motor. The light source lamp 39 may be another light source such as a high brightness LED.

  As shown in FIG. 5, the CPU 50 includes the shooting / projection switching button 16, the shutter button 17, the shooting / playback switching button 20, the zoom button 21, the feed button 22, the return button 23, and various operation buttons 24 to 26. And a motor driver 52 that controls a stepping motor 51 that adjusts the focus of the imaging projection lens 12, and an object image formed on the imaging plane 34 by the imaging projection lens 12 is output as an imaging signal. The CCD 33 that performs this operation and a strobe control circuit 53 that controls the light emission of the strobe light emitting unit 13 are connected. In addition, CDS (correlated double sampling circuit) 54, AMP (amplifier circuit) 55, A / D converter 56, image signal processing circuit 57, compression / decompression processing circuit 58, AE / AWB detection circuit 59, AF detection circuit 60, ROM 61, RAM 62, SDRAM (storage means) 63, LCD drivers 64 and 65 for controlling the LCD display panel 18 and the LCD panel 35, and a media controller 66, various circuits necessary for photographing and image processing are provided on the data bus 67. These basic functions are well known in digital cameras and will not be described in detail.

  The CPU 50 reads the sequence program stored in the ROM 61 into the RAM 62 which is a work memory, and executes these controls. The imaging signal output from the CCD 33 is input to the CDS 54, and after passing through the AMP 55 and the A / D converter 56, is temporarily stored in the SDRAM 63 via the data bus 67. The image signal processing circuit 57 reads the data of the imaging signal from the SDRAM 63, performs various image processing such as gradation conversion and γ correction processing, and then records the data again in the SDRAM 63 as image data. The image data recorded in the SDRAM 63 is converted into an analog composite signal by the LCD driver 64 and displayed as a through image on the LCD display panel 18. The image data is stored in the memory card 27 via the media controller 66 after being compressed in a predetermined compression format (for example, JPEG format). The image data stored in the memory card 27 can be read out and recorded again in the SDRAM 63. When the projection mode is selected by the shooting / projection switching button 16, the image data recorded in the SDRAM 63 is displayed on the LCD panel 35 and is displayed on the LCD panel 35 by the illumination light of the light source lamp 39. An image is projected from the imaging projection lens 12 toward the front screen 69.

  Next, a procedure and an operation related to image capturing by the digital camera 10 and projection display of the captured image will be described. When shooting an image to be used, both the shooting projection switching button 16 and the shooting / playback switching button 20 are set to the shooting mode. The shooting procedure is omitted because it is the same as that of a normal digital camera, but the shot image is stored in the SDRAM 63. Alternatively, the memory card 27 may be loaded in the slot, and the image stored in the slot may be read and stored in the SDRAM 63.

  As shown in FIG. 6, when the shooting / projection switching button 16 is set to the projection mode, the mirror 31 becomes the second position 31b with the reflecting surface 32 tilted toward the LCD panel 35, and the second optical path 42 is formed. It is formed. Regardless of the selection of the shooting / playback switching button 20, the playback mode is entered and the image stored in the SDRAM 63 is displayed on the LCD display panel 18 and formed on the LCD panel 35. At the same time, the light source lamp 39 is turned on, and the illumination light emitted from the light source lamp 39 passes through the diffusion plate 37 and the polarizing plate 36 and is irradiated onto the LCD panel 35. The irradiated illumination light passes through the LCD panel 35 on which an image is formed and is emitted as image light from the LCD panel 35, and is reflected by the reflecting surface 32 of the mirror 31 that forms the second optical path. The light enters the imaging projection lens 12, passes through the imaging projection lens 12, and is projected on the front screen 69. At this time, if the projected image is out of focus, the focus can be adjusted by operating the feed button 22 or the return button 23.

  The focusing can be automatically performed. When the projection mode is selected by the shooting / projection switching button 16, one of the various operation buttons 24 to 26, for example, the operation button 24 is set as the focus button 24. When the focus button 24 is pressed, the photographing mode is temporarily changed, the mirror 31 is reversed, and the first optical path 41 is formed at the first position 31a in which the reflecting surface 32 is inclined toward the CCD 33. A through image is displayed on the LCD display panel 18, and AF detection is performed by the AF detection circuit 60, and the imaging projection lens 12 is focused. At this time, if the imaging projection lens 12 is aimed at the center of the screen 69, an error may occur in focusing. Therefore, it is preferable to capture a clear image such as a frame of the screen 69. When the focus button 24 is released after focusing, the projection mode is restored, and the mirror 31 becomes the second position 31b to form the second optical path 42.

  In the embodiment, the CCD 33 and the LCD panel 35 are arranged on the left and right with respect to the optical axis of the imaging projection lens 12, and the photographic light incident on the imaging projection lens 12 is left or right on the reflection surface 32 of the mirror 31. Although it is configured to be reflected, either one of the CCD 33 and the LCD panel 35 may be disposed on the optical axis of the imaging projection lens 12. For example, as shown in FIG. 7, the imaging / projecting unit 70 includes an LCD panel 35 disposed at the same position as in the above-described embodiment, and a CCD 33 disposed on the optical axis of the imaging / projecting lens 12. The first optical path 71 is a straight optical path, and the second position on the first optical path 71 is the same position as the second position 31b from the first position 73a where the mirror 73 (reflecting member) is retracted from the first optical path 71. 73b can be moved freely. By inserting the mirror 73 into the second position 73b, the same second optical path 72 as the second optical path 42 described above is formed.

  Next, another embodiment of the imaging apparatus with a projection display function according to the present invention will be described. In addition, as shown in FIG. 8, the same member as the above-mentioned embodiment uses the same symbol. The difference from the above-described embodiment is that the reflecting member constituting the imaging / projecting unit 80 is a reflecting prism 83 having a first reflecting surface 81 and a second reflecting surface 82, and the reflecting prism 83 is connected to the imaging / projecting lens 12. The point moves in a direction perpendicular to the direction. The reflecting prism 83 is formed such that the first reflecting surface 81 and the second reflecting surface 82 form 90 ° with each other, and is disposed with an inclination of 45 ° with respect to the optical axis of the imaging projection lens 12. Is done. When the shooting mode is selected, the first reflecting surface 81 of the reflecting prism 83 is disposed at the first position 83a on the optical axis of the imaging projection lens 12 to form the first optical path 41, and the imaging projection lens. The light emitted from 12 is reflected toward the CCD 33. When the projection mode is selected, the second reflecting surface 82 moves to the second position 83b on the optical axis of the imaging projection lens 12 to form the second optical path 42, and the image emitted from the LCD panel 35 Light is reflected toward the imaging projection lens 12.

  In the above-described embodiment, the digital camera 10 has been described as a portable photographing projector having an imaging device with a projection display function. However, the portable photographing projector having an imaging device with a projection display function according to the present invention is a digital camera. The present invention is not limited to a camera, and any portable electronic device may be used. For example, a mobile phone can be provided with an imaging device with a projection display function according to the present invention.

10 Digital camera (portable projector)
11 Camera body 12 Imaging projection lens (optical lens)
16 Shooting / Projection Switching Button 17 Shutter Button 18 LCD Display Panel 20 Shooting / Playback Switching Button 29 Imaging Device with Projection Display Function 30, 70, 80 Imaging Projection Unit 31, 73 Mirror (Reflection Member)
31a, 73a, 83a First position 31b, 73b, 83b Second position 32, 73 Reflecting surface 33 CCD (image sensor)
34 Imaging surface 35 LCD panel (image forming unit)
36 Polarizing Plate 37 Diffusion Plate 38 Image Forming Unit 39 Light Source Lamp 41, 71 First Optical Path 42, 72 Second Optical Path 50 CPU
60 AF detection circuit (AF detection means)
63 SDRAM (imaging signal storage means)
69 Screen 81 First reflective surface 82 Second reflective surface 83 Reflective prism (reflective member)

Claims (4)

An image sensor having an imaging surface on which a subject image is formed by an optical lens, and outputting the subject image formed on the imaging surface as an imaging signal;
Storage means for storing image data based on the imaging signal;
An image forming unit that displays the image data read from the storage unit, and uses illumination light emitted from a light source as image light corresponding to the image data;
A first position for guiding the subject light emitted from the optical lens to the image sensor; a second position for guiding the image light emitted from the image forming unit to the optical lens and projecting the image light on a screen; A reflective member that is freely displaceable,
And the reflection member is emitted from the image forming unit at the second position and a first reflection surface that reflects the subject light emitted from the optical lens at the first position toward the image sensor. An imaging with a projection display function , comprising: a second reflecting surface for reflecting the image light toward the optical lens, wherein the imaging light is movably provided between the first position and the second position. apparatus. The first reflecting surface and the second reflecting surface is formed in a 90 ° to each other, according to claim 1, characterized in that is arranged with an inclination of 45 °, respectively with respect to the optical axis of the optical lens Imaging device with projection display function. With an AF detection means for detecting the distance to the object, after the focus of the optical lens by the AF detection unit, according to claim 1 or 2, characterized in that for displacing the reflecting member to the second position The imaging device with a projection display function according to any one of the above. Portable imaging projector having a projection display function imaging apparatus according to any one of claims 1 to 3.

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