JP2005347816A - Imaging apparatus and optical scanning display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate the need for providing an image memory respectively when a sequential scanning display device and an interlaced scanning display device are used. <P>SOLUTION: A CCD sensor array 12 outputs charge signals corresponding to the optical image of an object formed by a taking lens 11 continuously, and an image processing circuit 13 converts the image information of one sheet into image signals. An image signal input unit 14 converts an analog output from the image processing circuit 13 into digital signals. An image processing engine 15 records the output image signal from the circuit 14 on a recording medium 15A while compressing. An image signal for finder is subjected to decimation and compression before being stored temporarily in an image signal holder 16. The image signal holder 16 outputs the stored data to the display device 3 or 4 in the signal order dependent on the fact whether the destination is a sequential scanning LCD display 4 or an interlaced scanning retina scanning display device 3. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an imaging device and an optical scanning display device, and more specifically to an imaging device including an electronic viewfinder and an optical scanning display device that can be used as an electronic viewfinder.

  A retina scanning type display device is described in Patent Document 1. FIG. 5 shows the structure of a torsional vibrator manufactured using the silicon microfabrication technology described in Patent Document 2 and the like. 5A is a plan view, and FIG. 5B is a cross-sectional view taken along line AA in FIG.

  101 is a fixed reference member, 102 and 103 are torsion bars that protrude from the member and are on one axis, and the torsional vibrator 105 is suspended by the torsion bars 102 and 103 and rotates freely. A piezoelectric element 104 is formed on the torsion bar 103, and the deformation amount of the torsion bar 103 is output as a voltage-voltage difference between the two output terminals. Reference numeral 106 denotes a coil formed on the torsional vibrator 105. An alternating current flowing through the coil 106 acts on a magnetic field formed by magnets 123A and 123B provided on a pedestal member 120, which will be described later, and the torsional vibrator 105 reciprocally rotates. The movement direction of the torsional vibrator 105 is referred to as vertical scanning because a light beam reflected by a mirror unit 110A described later is scanned in the vertical direction.

  Reference numerals 107 and 108 denote torsion bars protruding from the torsional vibrator 105 and support the torsional vibrator 110. On the surface 110A side of the torsional vibrator 110, aluminum is deposited on the entire surface, and functions as a scanner mirror that reflects incident light. A piezoelectric element 109 is also formed on the torsion bar 108, and the rotation angle can be detected from the difference component of the voltage output from the piezoelectric element 109 to the two output terminals according to the deformation amount of the torsion bar 108.

  The torsional vibrator 110 swings around the torsion bars 107 and 108 at a specific resonance frequency, and the spring constant of the torsion bars 107 and 108 and the torsional vibrator 110 of the torsional vibrator 110 so that the natural resonance frequency becomes 39.96 KHz. The mass has been determined. A mirror that reciprocally rotates around the torsion bars 107 and 108 scans a light beam of a light source, which will be described later, in the horizontal direction. Hereinafter, this is referred to as horizontal scanning.

  In FIG. 5B, reference numeral 120 denotes a basic member of the present apparatus, on which the various parts are assembled. Reference numeral 121 denotes a holding member for the reference member 101, which is fixed to the base member 120 via the holding member. 122A and 122B are drive electrodes installed adjacent to the torsional vibrator 110. When a voltage is applied between the electrodes 122A and 122B and the electrode portion 110B of the torsional vibrator 110, electrostatic force is applied to the torsional vibrator 110. It reaches. That is, the torsional vibrator 110 can be driven by applying a predetermined alternating voltage between the electrodes 122A and 122B and the electrode portion 110B of the torsional vibrator 110.

  The magnets 123A and 123B are fixed to the base member 120 and are installed so that the opposite polarities of the S and N poles are on the surface. By passing an alternating current through the coil 106 existing in the magnetic field formed by the two magnets 123A and 123B, the coil 106 receives a force in a direction determined by the direction of the current, and the torsional vibrator 105 rotates in a reciprocating manner. Continue exercise.

  Reference numerals 130, 131, 132, 133, 134, 135, and 136 are connection terminals provided on the reference member 101 for electrical connection with the drive circuit 17 (FIG. 6). The drive circuit 17 is one of the elements constituting the retina operation type display, and controls the drive of the mirror unit shown in FIG. 5 described above. In the vertical direction, the signal of the piezoelectric element 104 is monitored. However, a sawtooth wave-shaped vertical drive current is passed through the coil 106, and the entire torsional vibrator 105 is oscillated with the period of the sawtooth wave. In the horizontal direction, the driving force of the torsional vibrator is obtained by electrostatic force by applying a driving electrode AC voltage between the electrode portion 110B and the driving electrodes 122A and 122B. The frequency of the AC voltage substantially matches the natural resonance frequency of the torsional vibrator 110. Therefore, horizontal scanning is possible at a stable frequency with a small amount of driving energy.

  FIG. 7 shows a current waveform for driving the mirror unit by the above mirror control circuit. FIG. 7A shows a sinusoidal voltage applied between the drive electrodes 122A and 122B and the electrode 110B, and the mirror continues to reciprocate at 39,960 Hz in the horizontal direction. FIG. 7B shows a sawtooth current flowing in the coil 106. This sawtooth current drives the entire mirror 60 times per second in the vertical direction. The phase relationship with the driving signal in the horizontal direction is as shown in FIG. 7, and the rising period of the sawtooth current is the vertical scanning period. By monitoring the output voltage of the piezoelectric element 104, the vertical scanning state of the mirror unit can be monitored, and similarly, by monitoring the output voltage of the piezoelectric element 109, the horizontal scanning state of the mirror 110A can be monitored. The drive circuit 17 detects the movement of the mirror from these output voltages and controls the operation of the light source device 21 described later.

  The actual image drawing operation will be described with reference to FIG. FIG. 6 shows an embodiment of an electronic viewfinder using an optical scanning display device.

  6A, reference numeral 17 denotes a drive circuit for controlling the operation of the optical scanning display device, which controls the movement of the light source device 21 that is a component of the optical scanning display device and the entire mirror unit shown in FIG. To do. However, in FIG. 6A, for the sake of simplicity, only the mirror 110A is extracted from the entire mirror portion. The optical scanning device includes a light source device 21 including a dichroic prism that uniformly mixes three-color LEDs (light emitting diodes) of red (R), green (G), and blue (B) and light beams from the LEDs. It comprises a mirror part, a translucent screen 40, and a loupe 31 for enlarging an image formed on the screen 40.

  The drive circuit 17 outputs a control signal for controlling the light intensity of each of the R, G, and B LEDs in the light source device 21 and lighting / extinguishing. The light source device 21 emits a light beam with an arbitrary color and an arbitrary light intensity, and projects this onto the mirror 110A. The mirror unit is scanned in the horizontal and vertical directions in the above-described cycle by a signal from the drive circuit 17.

  With the configuration described above, an image is formed by sweeping the light beam whose luminance and color are modulated onto the screen 40 at high speed. The user observes the image on the screen 40 with the magnifier 31 enlarged. Thereby, the above-described device functions as a finder.

The image on the screen 40 is swept at a ratio of 3: 4 or 9:16 as shown in FIG. 6B. Regions 41 and 42 indicated by broken lines in FIGS. 6B and 6C are portions where an image is actually drawn. If the region 41 or 42 is out of this region, the light source device 21 stops the light beam. Such drawing is repeated 60 times per second. Due to the effect of the afterimage on the retina, the observer recognizes that a planar image exists instead of a line image or a point image.
Japanese National Patent Publication No. 11-505627 Special table 2001-519726 gazette

  In the retinal scanning device, as shown in FIG. 6B, the light beam that draws an image on the screen 40 reciprocates, so the control circuit that controls the light source determines the arrangement of the pixels constituting the image as a light beam. It is necessary to change according to the scanning direction. Therefore, in the retinal scanning device, it is indispensable to temporarily store image data and rearrange a part of pixel data. Incidentally, in the conventional display using, for example, a CRT (cold cathode tube), since the scanning direction is always constant, the pixel data can also be dealt with by reading in the order as read from the image sensor.

  On the other hand, an imaging device is required to have a small display panel on the back of the imaging device in addition to the viewfinder, and display an image there. A liquid crystal display device or the like is adopted as the display device, and these require the same arrangement of pixel data as that of a CRT or the like.

  As described above, when the retinal scanning display is employed as a finder display device, a data memory for at least one screen of an image to be displayed is required. However, when other display means are used in combination, the arrangement of the image data is different, and therefore a dedicated data memory for one more screen is required. Since the image memory requires high-speed writing / reading, it is disadvantageous in cost to provide a plurality of image memories.

  When a retina operation type display is adopted as a viewfinder, it takes a certain amount of time until an image is displayed on the viewfinder, as with other electronic viewfinders. This is not desirable, especially in a digital camera or the like that photographs a high-speed subject, because it increases the release time lag.

  It is an object of the present invention to provide an imaging apparatus and an optical scanning display device that can eliminate such inconveniences.

  An imaging apparatus according to the present invention includes an optical sensor array that converts an optical image of a subject into an electrical signal, a recording medium that records an image signal output from the optical sensor array, and a plurality of display modes. An image display means for displaying a signal as an image, and a signal conversion means for converting the transfer order of the image signals corresponding to each display mode of the image display means.

  An imaging apparatus according to the present invention includes an optical sensor array that converts an optical image of a subject into an electrical signal, a recording medium that records an image signal output from the optical sensor array, and display modes different from each other. Corresponding to the display mode of the first and second image display means for displaying the image of the signal, the selection means for selecting one of the first and second image display means, and the image display means selected by the selection means And a signal conversion means for converting the image signal in order of the signal.

  The optical scanning display device according to the present invention forms a visible image by narrowing a light beam into a beam shape, repeating high-speed sweeping in one plane, and changing the brightness according to the position in the plane. In this optical scanning display device, the scanning position of the screen is shifted by one line for each scanning, so-called interlaced scanning is performed, and the scanning of the second surface, which is performed following the scanning of the first surface, Starting from the vicinity of the end point of scanning, and ending near the start point of scanning of the first surface.

  An image pickup apparatus according to the present invention is an image pickup apparatus including a finder including an optical scanning display device that can handle sequential scanning and interlaced scanning, and switching means for switching between interlaced scanning and sequential scanning of the optical scanning display device. The switching means selects interlaced scanning when tracking a subject before photographing, and sequentially selects scanning when confirming a photographing screen after photographing.

  According to the present invention, in a photographing apparatus including a plurality of image display means, the image memory means dedicated to each display device is provided by including the signal conversion device that converts the arrangement of the pixel signals and the data suitable for each display means. It is no longer necessary to have

  According to the present invention, in a retinal scanning device, a signal generator having a plurality of vertical control signals and a signal converter for converting the arrangement of pixel signals can be used to display both interlaced scanning and sequential scanning. It becomes.

  According to the present invention, in a retinal scanning display device, interlaced scanning is adopted at the time of normal finder display, and switching to sequential scanning at the time of confirming a photographing screen, thereby achieving both viewfinder display with less time lag and fine viewfinder display. Can be made.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows a schematic block diagram of a digital camera according to an embodiment of the present invention. Reference numeral 1 denotes an imaging block that changes an object image into an electrical signal and sends it to the next stage. The imaging block 1 includes a photographing lens 11 and a CCD sensor array 12 and outputs an amount of electric charge corresponding to the intensity of incident light. Further, the image processing circuit 13 that converts charges into voltage converts image information for one sheet into an image signal that is a series of electrical signals. When the power is turned on, this block continues to operate, and the storage conditions are subjected to image processing based on instructions from the control circuit 5 so that an appropriate exposure amount can be obtained by the electronic shutter function of the CCD sensor array 12. The circuit 13 sets and sends an image signal relating to the captured image to the next stage. This image signal is used for finder display described later.

  The image processing circuit 13 reads out one frame by dividing it into two fields corresponding to the interlaced scanning in the sequential scanning mode in which one frame is transferred at a frequency of 60 times / second in accordance with the sequential scanning. And an interlaced scanning mode for transferring the image signal at a frequency of 120 times / second. The image processing circuit 13 operates in a scanning mode according to an instruction from the control circuit 5.

  The control circuit 5 controls the entire digital camera. The control circuit 5 includes a CPU that executes arithmetic processing and a control program, a memory circuit such as a RAM and a ROM, and the like, and most of various operation switches are provided in the control circuit 5. The control circuit 5 controls operations of the image processing circuit 13, the image processing engine 15, the image signal holding device 16, and the like.

  6 is a release button. When the photographer operates the release button 6 to instruct a shooting operation, the control circuit 5 instructs the imaging block 1 to set the shooting conditions, shutter speed, light emission / non-light emission of the flash device, and Each unit is controlled so as to capture one image signal in accordance with the subject distance and the like. This image signal is treated as a captured image, and is sent to the next stage after being distinguished from the image signal for finder display. This image signal is recorded on a recording medium 15A, which will be described later, through various processes in the subsequent stages. Reference numeral 9 denotes a selection switch for a display device as a finder, which is used to select a retinal scanning display and an LCD display.

  The image processing block 2 converts the captured image signal sent from the imaging block 1 into electronic data and writes it to a recording medium, and sends out the finder display image signal from the imaging block 1 to the display device after predetermined processing. It has a function.

  The image signal input device 14 including an A / D converter converts an analog voltage value corresponding to the light quantity of each sensor of the CCD sensor array 12 into a digital value and separates it into a luminance signal and a color difference signal.

  The image processing engine 15 performs data compression processing in accordance with the definition of JPEG or the like on the captured image signal among the image data sent from the imaging block 1 in accordance with an instruction from the control circuit 13. The compressed captured image signal is once sent to a buffer memory area (not shown) and then written to the recording medium 15A.

  The recording medium 15A is a kind of memory card on which a large number of semiconductor memories are mounted, and is detachable from the photographing apparatus.

  Image signals that are continuously sent other than captured images are subjected to processing such as partial thinning and compression of pixel signals as finder image data, and are supplied to the image signal holding device 16. A series of image processing is performed according to an instruction from the control circuit 5. It goes without saying that the signal processing procedure differs depending on whether the finder display is performed by interlaced scanning or sequential scanning.

  The image signal holding device 16 has a function as a signal conversion device. The image signal holding device 16 includes a VRAM 16A that temporarily stores image data. 2 and 3 show a configuration example of the image signal holding device 16.

  In the configuration shown in FIG. 2, the finder display pixel signal from the image processing engine 15 is once written in the VRAM 16A. The read address control pointer 16B functions as a signal conversion unit, and controls an address from which data is read when an image signal is sent to each finder device, thereby realizing an appropriate data arrangement corresponding to the finder device. Reference numeral 17 denotes a buffer for sending out VRAM data, and reference numeral 18 denotes a switch for selecting a data output destination. The switch 18 and the read address control pointer operate based on a control signal from the control circuit 5.

  In the configuration shown in FIG. 3, when the pixel signal from the image processing engine 15 is written into the VRAM, the write address control pointer 16C, which is a signal conversion means, specifies the write address. Similar to the configuration shown in FIG. 2, the write address control pointer 16 </ b> C operates based on a control signal from the control circuit 5.

  2 and 3, the output signal of the image signal holding device is transferred to one of the two display devices selected by the switch 18.

  Reference numeral 3 denotes the retinal scanning display device described above, and 4 denotes a TFT-driven color liquid crystal display device.

  FIG. 4 shows an external perspective view of this embodiment. Reference numeral 3A denotes an eyepiece of the finder, in which the retinal scanning display device 3 is installed. Reference numeral 4A denotes an image display unit of the color liquid crystal display device 4. Reference numeral 6A denotes a release button. A switch is installed at the bottom of the button portion. When the button 6A is pushed in, the release switch 6 is turned on from off. The display devices 3 and 4 function as a finder, but when the display device 3 is selected, an image appears inside the finder 3A, but nothing is displayed on the display device 4A. When the display device 4 is selected, an image is displayed on the image display unit 4A of the color liquid crystal display device 4, but no image is displayed on the display device 3. That is, in this embodiment, the display devices 3 and 4 are not driven simultaneously, and only one of the selected display devices is driven.

  The switch 9 can instruct the control circuit 5 to switch the display devices 3 and 4. If the switch 9 is on, the color liquid crystal display device 4 is selected, and if it is off, the retinal scanning device 3 is selected.

  In the digital camera described above, the retinal scanning device 4 has the configuration shown in FIG. 6A, and the image signal holding device 16 has the configuration shown in FIG. Will be explained.

  8, 9 and 10 are explanatory diagrams of the arrangement of finder image signals written in the VRAM 16A. FIG. 8 shows an example of data transferred by the image processing engine 15 from the image signal from the imaging block unit to the finder signal output device after performing a thinning process for finder display. In order to simplify the description, the pixel data is extremely small, and it is assumed that the display is performed with 12 × 8 = 96 pixels from the upper left A1 to the lower right L8 of the finder.

  The write control pointer 16C is an example of a signal conversion unit that converts the arrangement of data. When the retinal scanning display device is selected by the switch 9, the VRAM write address is controlled so that the data from the image processing engine 15 are arranged in the order shown in FIG. The VRAM sequentially transfers data requests from the retinal scanning device to the drive circuit 17 from the lower address to the higher address. As a result, the scanning direction of the light beam coincides with the data arrangement, and a normal image is formed in the viewfinder.

  When the LCD display 4 is selected by the switch 9, the write address pointer 16C controls the VRAM write address so that the data from the image processing engine 15 is arranged in the order shown in FIG. The VRAM sequentially transfers data requests from the LCD display device to the LCD display device from the lower address to the higher address. As a result, a normal screen is displayed on the image display unit 4 </ b> A of the liquid crystal display device 4.

  When the image signal holding device 16 has the configuration shown in FIG. 2, the image signal sent from the image processing engine 15 is written as it is from the lower address to the higher address in the VRAM 16A. However, when data is transferred in response to a request from the finder device, the data read address of the read address control pointer 16B depends on whether the data transfer destination display device, that is, the LCD display 4 or the retinal scanning display device 3, is used. Change the settings and send out the data in the order that normal image output is possible. Thereby, the effect similar to the case of the structure shown in FIG. 3 can be acquired.

  In the retinal scanning display device, interlaced scanning can be performed by a scanning method different from the conventional one. FIG. 11B shows an image drawing method described so far, which shows a kind of so-called sequential scanning. On the other hand, the scanning shown in FIG. 11C is a kind of interlaced scanning in which the areas scanned in the forward path and the backward path are shifted by one line. FIG. 11A is an enlarged view of a part of FIG. 11C, where the solid line indicates the forward path, that is, the trajectory at the time of scanning from top to bottom, and the broken line indicates the return path, that is, from bottom to top. The trajectory during scanning is shown.

  50 indicates the width of the drawing period, and only during this period, the light source device turns on the light beam. The range scanned by the mirror is beyond the drawing period. This is to avoid using this region for drawing because the sweep speed is greatly changed at both ends where the scanning direction changes, and it is difficult to control the light beam.

  In FIG. 11C, since the light beam is swept in the return path between the lines swept in the forward path, one screen is scanned and drawn in two times, which is a kind of so-called interlaced scanning. . The configuration of the mirror unit for realizing the interlaced scanning can be dealt with by simply changing the drive waveform for sweeping the mirror without changing anything from the first embodiment.

  Specifically, in the sequential scanning, the vertical sweep signal is a sawtooth wave shown in FIG. 7B, but in the interlaced scanning, it is necessary to have a mountain-shaped current waveform shown in FIG. 7C. Further, the arrangement of pixel signals for drawing needs to be changed from FIG. 8A to FIG. 8C. As a matter of course, the read address control pointer 16B or the write address control pointer 16C shown in FIG. 1B as a signal exchange means acts as a means for changing the data arrangement.

  In general, in interlaced scanning, pixel data is updated and drawn in half, so that the image update rate can be performed in about half the period of sequential scanning. The use of interlaced scanning for finder display shortens the screen update time and leads to a decrease in the release time lag.

  On the other hand, sequential scanning is excellent in drawing a still image because a precise screen is obtained, and can provide a higher-definition screen when confirming a captured image after shooting. In order to take advantage of this feature, in the imaging apparatus of the present embodiment, the drive circuit 17 of the retinal scanning device includes at least two types of drive signals shown in FIGS. 7B and 7C, and the control circuit 5 When driving the retinal scanning device, the retinal scanning device is controlled so as to perform interlaced scanning, and immediately after the photographing is finished, the photographic image is displayed by switching to the sequential scanning for a short period of time determined for confirmation of the photographed image. Thus, the drive circuit 17 is controlled.

  This process reduces the delay in displaying the finder image by drawing with interlaced scanning during normal viewfinder display, and displays a fine screen by switching to sequential scanning when checking the shooting screen after shooting. An easy-to-use imaging device is realized.

  FIG. 6C shows a so-called high-definition screen ratio (aspect ratio 9:16), which is slightly wider than the general aspect ratio 3: 4 shown in FIG. 6B. . By expanding the horizontal scanning width of the retinal scanning device shown in FIG. 6A and corresponding the image signal to be displayed, it is possible to cope with either display form.

  In order to increase the horizontal scan width, the amplitude of the horizontal scan signal provided in the drive circuit 17, that is, the signal shown in FIG. 7A may be set larger in accordance with the scan width.

  With respect to the image signal, the control circuit 5 controls the image engine 15 so as to extract a wider range of data in the horizontal direction and send it to the image signal holding device 16, and the read address control pointer of the image signal holding means as the signal converting means. A function for converting the data suitable for the arrangement of the high-definition image signal is added to the 16B or the write address control pointer 16C in advance, and the image signal is adapted to the high-definition image by the instruction of the control circuit 5. Accordingly, it is possible to easily change the aspect ratio of the screen with the retinal scanning device.

  In the above-described embodiment, data arrangement corresponding to a plurality of display means can be performed in one image memory, and it is not necessary to provide a dedicated image memory for each display device.

  The retinal scanning display device includes a vertical drive signal switching means and a signal conversion means for arranging image data, and the vertical drive signal and image signal conversion means in the drive signal switching means according to the display form. By changing the arrangement of the signals, the interlaced scanning and the sequential scanning can be switched and displayed without the need to change or add the mechanism surface.

  A display device with different display modes for normal finder display and photographic image confirmation after shooting. By adopting interlaced scanning during finder operation and sequential scanning when checking photographic images, Images are updated more quickly at the time of the viewfinder, so that the display delay of the viewfinder image is shortened to prevent the release time lag from becoming longer, and a finer image can be displayed at the time of confirming the photographed image.

  By providing switch means for switching between sequential scanning and interlaced operation in the retinal scanning display device, it is possible to select an optimal image display depending on the subject and the state of the image to be observed.

1 is a block diagram of a digital camera as one embodiment of the present invention. FIG. FIG. 3 is a schematic configuration block diagram illustrating a configuration example of an image signal holding device 16. FIG. 6 is a schematic configuration block diagram showing another configuration example of the image signal holding device 16. It is drawing which shows the external appearance from the back surface of a digital camera. It is drawing of the mirror part of a retinal scanning display device. It is a block diagram of a retinal scanning display device. It is a drive signal of a retinal scanning type device. It is an example of arrangement | positioning of the image signal displayed on a finder. It is an example of arrangement | positioning of the image signal displayed on a finder. It is an example of arrangement | positioning of the image signal displayed on a finder. A light beam scanning method for a retinal scanning display device.

Explanation of symbols

1: imaging block 2: image processing block 3: retinal scanning display device 4: LCD display 5: control circuit 6: release switch 7: digital camera body 8: lens barrel 9: finder changeover switch 11: taking lens 12: CCD Sensor 13: Image processing circuit 14: Image signal input device 15: Image processing engine 16: Image signal holding device 17: Drive circuit 18: Changeover switch 19: Buffer 21: Light source 31: Eyepiece 40: Screen 41: Drawing range 42: Drawing range 101: reference member 102: torsion bar 103: torsion bar 104: piezoelectric element 105: torsional vibrator 106: coil 107: torsion bar 108: torsion bar 109: piezoelectric element 110: torsional vibrator 120: foundation member 121: holding Member 122A, 122B: Drive electrode 123A, 124B: Magnet 30-136: connection terminal

Claims (9)

An optical sensor array for converting an optical image of a subject into an electrical signal;
A recording medium for recording an image signal output from the photosensor array;
Image display means having a plurality of display modes and displaying the image signal;
An image pickup apparatus comprising: signal conversion means for converting the transfer order of the image signals corresponding to each display mode of the image display means.   The imaging apparatus according to claim 1, wherein the plurality of display modes include interlaced scanning and sequential scanning. An optical sensor array for converting an optical image of a subject into an electrical signal;
A recording medium for recording an image signal output from the photosensor array;
First and second image display means having different display modes and displaying the image signal,
Selecting means for selecting one of the first and second image display means;
An image pickup apparatus comprising: a signal conversion unit configured to convert the image signal sequentially in a signal corresponding to a display mode of the image display unit selected by the selection unit.   4. The signal conversion apparatus according to claim 1, wherein the signal conversion device includes image memory means for temporarily storing the image signal, and address designation means for designating an address of a storage position of the image memory means. Imaging device.   4. The imaging apparatus according to claim 3, wherein the address designating unit designates a write address of the image memory unit for the image signal.   4. The imaging apparatus according to claim 3, wherein the address designating unit designates a read address of the image memory unit for the image signal. An optical scanning display device that forms a visible image by narrowing light rays into a beam, repeating high-speed sweeping in one plane, and changing brightness according to the position in the plane,
Perform the so-called interlaced scanning, which shifts the scanning position of the screen by one line for each scanning,
An optical scanning type characterized in that the scanning of the second surface performed following the scanning of the first surface starts near the end of the scanning of the first surface and ends near the starting start of the scanning of the first surface. Display device.   8. The optical scanning display device according to claim 7, wherein both the sequential scanning and the interlaced scanning can be supported, and the scanning method can be arbitrarily switched by operating the switch means. A finder consisting of an optical scanning display device capable of handling sequential scanning and interlaced scanning;
An image pickup apparatus comprising interlaced scanning and switching means for switching between sequential scanning of the optical scanning display device,
An image pickup apparatus characterized in that the switching means selects interlaced scanning when tracking a subject before photographing, and sequentially selects scanning when confirming a photographing screen after photographing.

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