JP4887272B2 - Adapter for image rotation - Google Patents

Description

  The present invention relates to an image rotation adapter, and more particularly, to an image rotation adapter that is mounted between a photographing lens and a camera to give a special effect to an image photographed by the camera.

  Conventionally, a method using a special filter is known as a technique for giving a special effect to an image photographed by a camera. In this method, a special filter such as a cloth, a snow cloth, or a mirage is inserted in the light path to generate a light stripe from the bright part of the subject (see, for example, Patent Documents 1 to 4). In this case, the filter inserted into the optical path is replaced using a turret mechanism.

In addition, as a technique for rotating a video image taken by a television camera to give a special effect, a technique for rotating an image pickup device installed in the television camera together with a color separation prism is known (for example, Patent Document 5). Etc.).
Japanese Examined Patent Publication No. 2-44185 Japanese Patent Application Laid-Open No. 64-35534 JP 59-101632 A Japanese Utility Model Publication No. 55-1087 JP-A-7-203466

  However, as described in Patent Documents 1 to 4, the method of giving a special effect to an image using a special filter has a drawback that the apparatus is enlarged because the filter is replaced using a turret mechanism. .

  In addition, the method of rotating the image sensor to give a special effect by rotating the image must have a mechanism for rotating the image sensor on the camera side and cannot be implemented with an existing camera. There is. Although it is possible to provide a mechanism for rotating the image sensor on the lens side, there is a disadvantage that even in such a case, it cannot be implemented with an existing lens. Further, if a mechanism for rotating the image sensor on the camera side is provided, there is a drawback that the camera becomes large and complicated. Furthermore, when the image sensor is rotated, there is a problem that noise is generated in a signal output from the image sensor.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an image rotation adapter capable of giving a special effect to an image shot by a camera using an existing camera and a shooting lens. And

  In order to achieve the above object, according to the first aspect of the present invention, a photographic lens is detachably provided to a camera body, and a subject image that has passed through the photographic lens is passed through a prism built in the camera body. A camera imaged on the light receiving surface of the image sensor is detachably mounted between the photographing lens and the camera body, and rotates a subject image imaged on the light receiving surface of the image sensor. An image rotation adapter formed with an optical path length close to a prism built in the camera body, and a subject image that has passed through the photographing lens is formed at a predetermined position in the image rotation adapter. A first prism that is disposed in the optical path and reflects the subject light that has passed through the photographing lens an odd number of times to invert the subject image that has passed through the photographing lens, and an incident optical axis and an outgoing optical axis are formed on the same axis. The The light beam is disposed on the optical axis of the subject light after passing through the first prism and once imaged, and is supported rotatably around the optical axis, and the subject light that has passed through the first prism is odd-numbered times. A second prism that further reflects the subject image reflected and inverted by the first prism; and a relay optical system that re-images the subject image that has passed through the second prism on the light receiving surface of the imaging device; Rotation drive means for rotating the second prism, control means for controlling the rotation drive means, rotation instruction means for instructing the control means to start and stop rotation drive, and the second prism Target position setting means for presetting at least one target position to be stopped; and a preset for instructing the control means to execute a preset for moving the second prism to the target position. Instruction means, speed adjustment means for adjusting the rotation speed of the second prism, and detection means for detecting the rotation position and rotation direction of the second prism, and when the execution of the preset is instructed, The control means controls the position of the second prism so as to move to the target position by the rotation driving means using the detection result of the detection means, and the second prism is brought to the target position by the speed adjustment means. Provided is an image rotation adapter characterized in that the rotation speed at the time of movement can be adjusted.

  As a result, when the adapter for image rotation according to the present invention is mounted between the photographic lens and the camera body and the second prism is rotated by controlling the rotation driving means by the control means, When the subject image to be formed rotates around the optical axis and preset is executed, the second prism can be moved to a preset target position.

  According to another aspect of the present invention, when the execution of the preset is instructed while the second prism is stopped, the control means rotationally drives the second prism in the direction of the shortest distance to thereby achieve the target position. When the execution of the preset is instructed while the second prism is rotating, the control means moves the second prism while maintaining the rotation direction of the second prism. Position control is performed so as to stop at the target position.

  Accordingly, the second prism can be smoothly moved to the target position and stopped.

  According to a third aspect of the present invention, when the preset is executed while the second prism is rotating, the control means performs position control so as not to change the rotation speed of the second prism. And

  As a result, even if the preset is executed while the second prism is rotating, the rotation speed does not change, so that it is possible to obtain a video with no sense of incongruity.

  According to a fourth aspect of the present invention, the speed adjusting means can adjust the rotational speed of the second prism while the second prism is rotating or while the preset is being executed.

  Thereby, a sufficient special effect can be obtained in any case.

  In the image rotation adapter, the control means may further perform forced erecting by forcibly moving the second prism to an erect position where the subject erects. A forced erecting instructing means for instructing and an erecting position setting means for presetting the erecting position, and the control means sets the second prism to the erecting position when the forced erecting is instructed. The position control is performed so as to be moved, and the forced erect position is rewritable.

  Thereby, even if the image is rotating or the camera is tilted, an erect image of the subject can be obtained immediately anytime.

  As described above, when the image rotation adapter according to the present invention is mounted between the photographic lens and the camera body and the second prism is rotated by controlling the rotation driving means by the control means, the light receiving of the image sensor. When the subject image formed on the surface rotates around the optical axis and preset is executed, the second prism can be moved to a preset target position, and sufficient special effects can be obtained in photographing. .

  Hereinafter, an image rotation adapter according to the present invention will be described in detail with reference to the accompanying drawings.

  FIGS. 1A to 1C are system configuration diagrams of a television camera system in which an image rotation adapter according to the present invention is incorporated.

  As shown in FIG. 1A, the television camera system 10 includes a television camera 12, a photographing lens 14, and an image rotation adapter 16.

  The image rotation adapter 16 is an adapter that is used when a video image captured by the television camera 12 is rotated to give a special effect, and is attached between the television camera 12 and the photographing lens 14 as necessary. . That is, as shown in FIG. 1B, the image rotation adapter 16 is mounted between the TV camera 12 and the photographing lens 14 when rotating an image to give a special effect, and performs special effect shooting. If not, the television camera 12 is removed. Therefore, when the special effect shooting is not performed, the shooting lens 14 is directly attached to the television camera 12 as shown in FIG.

  The taking lens 14 is provided with a lens side mount 18 at the rear end thereof, and the lens side mount 18 is attached to a camera side mount 20 provided at the front end of the camera body 12A of the TV camera 12. Attached to the camera body 12A.

  The image rotation adapter 16 is provided with a rear side mount 22 having the same configuration as the lens side mount 18 at the rear end thereof. By attaching the rear side mount 22 to the camera side mount 20 of the TV camera 12, a television camera is provided. 12 is configured so that it can be mounted.

  In addition, a front mount 24 having the same configuration as the camera-side mount 20 is provided at the tip of the image rotation adapter 16, and the lens-side mount 18 of the photographing lens 14 is attached to the front-side mount 24. 14 can be attached to the image rotation adapter 16.

  FIG. 2 is a schematic configuration diagram of an optical system in the television camera system 10 shown in FIG.

  In the figure, the configuration of each lens is shown in a simplified manner, and there is also a case in which a lens group composed of a plurality of lenses is shown as one lens.

  As shown in FIG. 2, a focus lens 32, a zoom lens 34, an iris 36, and a relay lens 38 are arranged in order from the front side in the lens barrel 30 of the photographing lens 14. Subject light incident from the front end of the photographic lens 14 passes through each of these lenses and is emitted from the rear end of the photographic lens 14.

  In the case 40 of the image rotation adapter 16, a first prism 42, a second prism 44, a first relay lens 46, and a second relay lens 48 are disposed on the optical axis O of the photographing lens 14. The subject light emitted from the rear end of the photographing lens 14 travels along the optical axis O of the photographing lens 14 and passes through the first prism 42, the second prism 44, the first relay lens 46, and the second relay lens 48. The light is emitted from the rear end of the image rotation adapter 16.

  In the camera body 12A of the television camera 12, a color separation prism 52 is disposed on the optical axis O of the photographing lens 14, and subject light emitted from the rear end of the image rotation adapter 16 is the color separation prism 52. Is decomposed into R (red), G (green), and B (blue) color components. Then, the subject light separated into the respective color components is incident on the light receiving surfaces of the image pickup devices 54R, 54G, and 54B for the respective color components. The subject light incident on the light receiving surfaces of the image sensors 54R, 54G, and 54B is converted into electrical signals by the image sensors 54R, 54G, and 54B, and then subjected to signal processing by a known image signal processing unit. The video signal is output or recorded on a recording medium.

  FIG. 3 is a schematic diagram showing a schematic configuration of an embodiment of the image rotation adapter according to the present invention.

  As described above, in the image rotation adapter 16, the first prism 42, the second prism 44, the first relay lens 46, and the second relay lens 48 are disposed on the optical axis O of the photographing lens 14 in the case 40. The subject light emitted from the rear end of the photographing lens 14 passes through the first prism 42, the second prism 44, the first relay lens 46, and the second relay lens 48, and is emitted from the rear end of the image rotation adapter 16. Is done.

  The case 40 is formed in a cylindrical shape, and the front mount 24 is formed on the front end surface thereof, and the rear mount 22 is formed on the rear end surface thereof.

  The first prism 42 is composed of a Pechan prism, is held by a holding frame (not shown), and is fixed on the optical axis O of the photographing lens 14.

  The Pechan prism is a kind of prism in which triangular prisms are arranged to face each other with a slight air layer, and an optical path as shown in FIG. 4 is formed. That is, the light incident on the first triangular prism 42A via the photographing lens 14 is reflected by the surface A1, then reflected by the surface A2, and exits from the surface A1 and exits to the air layer H. The light emitted to the air layer H is incident on the surface B1 of the second triangular prism 42B, is reflected by the surface B2, is further reflected by the surfaces B3 and B1, and is emitted from the surface B2. At this time, the light is emitted along the optical axis O.

  As described above, the first prism 42 configured by the Pechan prism reflects the light incident along the optical axis O five times and emits the light along the optical axis O. Since this reflection is an odd number of times, the image is inverted and emitted.

  The optical path length of the first prism 42 is the same as the optical path length of the color separation prism 52 built in the camera body 12A.

  The subject light emitted from the first prism 42 forms an image once between the first prism 42 and the second prism 44 in the focused state, and then enters the second prism 44. Hereinafter, the position where the subject image is formed between the first prism 42 and the second prism 44 is referred to as a first image forming position.

  Here, as described above, the first prism 42 is formed with the same optical path length as that of the color separation prism 52 incorporated in the camera body 12A, so that an image formed at the first image formation position is captured. An image is formed in consideration of the aberration assumed by the lens 14.

  That is, the photographic lens 14 is designed for aberration and the like with respect to the television camera 12 having the color separation prism 52 in the camera body 12A in consideration of the presence of the color separation prism 52. Therefore, by setting the optical path length of the first prism 42 to be the same as the optical path length of the color separation prism 52, it is possible to form a good image in consideration of aberrations and the like at the first imaging position.

  Similarly to the first prism 42, the second prism 44 is a Pechan prism, and is disposed on the optical axis of the subject light emitted from the first prism 42. In this example, the first prism 42 is a Pechan prism, and the incident optical axis and the outgoing optical axis are formed on the same axis. Arranged on the optical axis O.

  In addition, since the second prism 44 is composed of a Pechan prism like the first prism 42, the subject light incident on the second prism 44 is reflected five times within the prism and then is reflected on the optical axis O. Is emitted along. Since this reflection is an odd number of times, the image is inverted and emitted.

  Here, the image incident on the second prism 44 is the image inverted by the first prism 42, so the inverted image is further inverted and returned to its original state. That is, the image emitted from the second prism 44 is the same as the image emitted from the photographing lens 14 (= the image incident on the first prism 42).

  As described above, the second prism 44 has a function of reversing the image inverted by the first prism 42 an odd number of times, thereby further inverting the image.

  As shown in FIG. 3, the second prism 44 is held by the prism holding frame 60 and disposed on the optical axis O of the photographing lens 14.

  The prism holding frame 60 is formed in a cylindrical shape, and the second prism 44 is accommodated and held on the inner periphery thereof. The prism holding frame 60 is supported by a bearing 62 installed in the case 40 so as to be rotatable around the optical axis O. The second prism 44 rotates around the optical axis O by rotating the prism holding frame 60.

  A gear 64 is integrally formed on the outer periphery of the prism holding frame 60. A driving gear 66 is engaged with the gear 64. The drive gear 66 is connected to an output shaft of a prism rotation drive motor 68 installed in the case 40, and rotates forward and backward by driving the prism rotation drive motor 68. Then, as the drive gear 66 rotates, the prism holding frame 60 rotates and the second prism 44 rotates around the optical axis O.

  Thus, the second prism 44 rotates around the optical axis O by driving the prism rotation drive motor 68. As the second prism 44 rotates around the optical axis O, the subject image emitted from the second prism 44 rotates around the optical axis O. This rotation rotates at twice the speed of the second prism 44. That is, when the second prism 44 rotates 45 degrees, the image emitted from the second prism 44 rotates 90 degrees, and when the second prism 44 rotates 90 degrees, the image emitted from the second prism 44 rotates 180 degrees. To do.

  The control system for controlling the driving of the prism rotation drive motor 68 will be described later in detail.

  The subject light emitted from the second prism 44 passes through the first relay lens 46 and the second relay lens 48 and is emitted from the image rotation adapter 16.

  The first relay lens 46 and the second relay lens 48 constitute a relay optical system, condensing the subject light emitted from the second prism 44, and image sensors 54R, 54G built in the camera body 12A. Re-image is formed on the light receiving surface 54B.

  Thus, the same subject image is formed on the light receiving surfaces of the image sensors 54R, 54G, and 54B, regardless of whether or not the image rotation adapter 16 is attached.

  FIG. 5 shows an outline of a rotational drive control system that rotates the second prism 44 around the optical axis O.

  As shown in FIG. 5, the prism rotation drive motor 68 that rotates the second prism 44 is controlled by the microcomputer 70. The microcomputer 70 sends a drive signal to the prism rotation drive motor 68 via a D / A (digital / analog converter) 72 to control the rotation drive.

  The prism rotation drive motor 68 is provided with an encoder 74, and a signal detected by the encoder 74 is counted by a counter 76 and output to the microcomputer 70 as rotation position information of the output shaft. In this embodiment, one rotation (0 ° to 360 °) is represented by a digital value from 0 to 4095, and the rotation direction and position of the second prism 44 are detected and controlled.

  Various operation buttons (operation switches) for inputting signals for instructing the microcomputer 70 to perform various controls are provided. For example, a right rotation button R for instructing rotation in the right direction (forward direction, clockwise), a left rotation button L instructing rotation in the left direction (negative (reverse) direction, counterclockwise), forcibly positive Forced erecting button (reset button) 80a for returning to the erect position (position where the subject image erects), a shot button (SHOT1) for executing a so-called preset to rotate to a preset target position (shot position) and stop ) 82a, a forced erect position button (forced erect MEMO) 80b for setting a forced erect position and a target position (shot position) for the forced erect button 80a and the shot button 82a, respectively, A position setting button (SHOT1MEMO) 82b is provided.

  It should be noted that a plurality of shot buttons and shot position setting buttons are preferably provided such as SHOT2, SHOT2MEMO,... So that a plurality of target positions can be set instead of one, but a flowchart described later was used. In order to simplify the description of the specific control, the following description will be made assuming that there is one shot button.

  In addition, a speed adjustment volume 84 for setting / adjusting the rotational speed, and an analog / digital converter (A / D) 86 for converting an analog signal input from the speed adjustment volume 84 into a digital signal and inputting the digital signal. And a memory 88 and the like for storing a preset forced erect position and a target position, and storing a control program executed by the microcomputer 70.

  When the right rotation button R is pressed while the second prism 44 is stopped, the second prism 44 starts rotating right, and when it is pressed again, the right rotation button R stops rotating right. As described above, once the right rotation button R is pressed once, the right rotation is continued even if the right rotation button is not continuously pressed. Therefore, after pressing, the hand can be released from the button, and the hand becomes free. Further, when the right rotation button R is pressed during the right rotation, the rotation is stopped, and when the right rotation button R is pressed during the left rotation, the right rotation is performed. The same applies to the left rotation button L.

  Here, instead of such a button, you can use a seesaw type switch to switch between right rotation and left rotation, rotate while pressing the switch, and stop when you release your hand, Such a seesaw type switch has a problem that the switch cannot be released because it must be held down by hand during rotation. Therefore, in this embodiment, a button (switch) for starting / stopping rotation and a volume for adjusting the rotation speed are provided in place of the seesaw. As a result, hands can be released even during rotation, and the burden on the photographer can be reduced.

  As described above, the image rotation adapter 16 is used when performing special effect shooting. Therefore, when the special effect shooting is not performed, the shooting lens 14 is directly attached to the camera body 12A as shown in FIG. In this case, the light that has passed through the photographing lens 14 is directly incident on the camera body 12A and is received by the image sensors 54R, 54G, and 54B via the color separation prism 52. Note that normal shooting is possible even with the image rotation adapter 16 attached.

  On the other hand, when performing special effect shooting in which the image is rotated as necessary, the image rotation adapter 16 is mounted between the shooting lens 14 and the camera body 12 as shown in FIG. I do.

  When the image rotation adapter 16 is attached, the light that has passed through the photographing lens 14 is received by the imaging elements 54R, 54G, and 54B via the image rotation adapter 16. Specifically, after passing through the photographing lens 14, it enters the image rotation adapter 16 and enters the TV camera 12 via the first prism 42, the second prism 44, the first relay lens 46, and the second relay lens 48. Emitted.

  At this time, the subject light is reflected five times in the first prism 42 and emitted onto the optical axis O when passing through the first prism 42. This inverts the image.

  The subject light that has passed through the first prism 42 forms an image at the first image formation position and then enters the second prism 44. Then, it is reflected five times by the second prism 44 and emitted onto the optical axis O. As a result, the inverted image is inverted again and restored.

  The subject light that has passed through the second prism 44 passes through the first relay lens 46 and the second relay lens 48 that constitute the relay optical system, and is emitted from the image rotation adapter 16. The subject light emitted from the image rotation adapter 16 is imaged on the light receiving surfaces of the image sensors 54R, 54G, and 54B via the color separation prism 52 of the television camera 12.

  The subject image formed on the light receiving surfaces of the image sensors 54R, 54G, and 54B rotates about the centers of the image sensors 54R, 54G, and 54B by rotating the second prism 44.

  The rotation of the subject image formed on the light receiving surfaces of the imaging elements 54R, 54G, and 54B is twice the rotation of the second prism 44. That is, when the second prism 44 is rotated once, the subject image formed on each of the image sensors 54R, 54G, and 54B rotates twice. Therefore, when the second prism 44 is rotated by 90 degrees, the subject images formed on the image sensors 54R, 54G, and 54B are rotated by 180 degrees.

  The rotation operation of the second prism 44 is performed by the right rotation button R or the left rotation button L. Based on the input from the right rotation button R or the left rotation button L, the second prism 44 is rotationally driven. For example, when the right (positive) rotation button is operated (pressed), the operation signal is input to the microcomputer 70. The microcomputer 70 outputs a drive signal based on the operation signal, and rotates the prism rotation drive motor 68 to the right. As a result, the second prism 44 rotates rightward (forward rotation, clockwise rotation) at a predetermined rotation speed (rotation speed set by the speed adjustment volume 84), and forms an image on each of the image sensors 54R, 54G, and 54B. The subject image rotates to the right. Conversely, when the left rotation button L is operated (pressed), the operation signal is input to the microcomputer 70. The microcomputer 70 outputs a drive signal based on the operation signal, and rotates the prism rotation drive motor 68. As a result, the second prism 44 rotates counterclockwise (reverse rotation, counterclockwise rotation) at a predetermined rotation speed, and the subject images formed on the image sensors 54R, 54G, and 54B rotate counterclockwise.

  As described above, when the right rotation button R or the left rotation button L is operated, the second prism 44 is rotated, and the subject images formed on the imaging elements 54R, 54G, and 54B are rotated.

  The second prism 44 is located at a predetermined reference position in the initial state. At this position, the same image as that when the image rotation adapter 16 is not mounted is formed on the light receiving surfaces of the image sensors 54R, 54G, and 54B. That is, the subject image formed on the light receiving surfaces of the image sensors 54R, 54G, and 54B changes (rotates) according to the rotational position of the second prism 44, and therefore the image rotation adapter 16 is attached in the initial state. It is located at a predetermined reference position so that the same subject image as that when it is not taken is captured.

  Thus, even if the image rotation adapter 16 is left attached to the television camera 12, normal shooting can be performed. As a result, even when switching between normal shooting and special effect shooting, the camera can be used without troublesome attachment / detachment operations.

  Further, when the forced erecting button 80a is operated, the second prism 44 is forcibly returned to a preset erecting position (reference position). Thereby, the same subject image (subject image without inclination) as when the image rotation adapter 16 is not attached can be taken.

  Various modes can be adopted as the mode of rotating the second prism 44. For example, the second prism 44 may be rotated while the right rotation button R or the left rotation button L is being pressed, or the aspect may be rotated a predetermined number of times when the right rotation button R or the left rotation button L is pressed once. Further, various modes such as rotating to a preset shot position by pressing the shot button 82a can be adopted.

  Further, the target position setting method for setting the preset is not limited to the position setting button as described above. For example, the current position at that time may be set by long pressing the shot button.

  As described above, by attaching the image rotation adapter 16 of the present embodiment, it is possible to perform special effect shooting in which an image is rotated and shot as necessary. Since the image rotation adapter 16 can be used for the existing photographing lens 14 and the television camera 12, a special photographing function can be easily added to the existing television camera system.

  Further, the image rotation adapter 16 of the present embodiment can shoot the same video as when it is not attached, even when it is attached to the TV camera 12, so it is not attached when it is attached. The shooting operation can be performed with the same operational feeling as the case. That is, the photographing operation can be performed by the same operation as usual without performing the reversal processing of the captured video and the setting switching operation for performing the reversal processing. Thereby, a user-friendly system can be constructed.

  Further, the image rotation adapter 16 of the present embodiment is configured to form an image once in the image rotation adapter 16. At this time, since the first prism 42 having the same optical path length as the optical path length of the color separation prism 52 in the television camera 12 is arranged in the optical path before image formation, a good image in consideration of aberrations and the like is formed. Can be imaged. Thereby, it is possible to shoot a good video with the television camera 12 without impairing the performance of the photographic lens 14.

If the subject image is simply rotated, a prism that reflects the subject light an odd number of times (odd number reflection prism) may be arranged in the photographing optical path and the prism may be rotated (the subject light is reflected an even number of times). In the case of the prism to be rotated, the subject image cannot be rotated even if it is rotated.)
However, when an odd number of times of reflection prisms are used, there is a problem that the back image of the image before being incident on the prism becomes an image (a horizontally reversed image). Therefore, it is necessary to return the background image to a front image (an image that is not horizontally reversed) somewhere.

  To return the back image to the front image, the odd-numbered reflection prism may be used again. However, a space for arranging the odd-numbered reflection prism is required. There is a problem of becoming.

  Further, the photographed image can be returned to the cover by image processing. However, in this method, there is a problem that the function must be added to the television camera side.

  On the other hand, when an adapter like the present invention is arranged between an existing photographing lens and an existing television camera, the positional relationship between the photographing lens and the television camera is shifted by the thickness of the adapter, and the imaging position is also shifted. Become.

  In view of this, the present invention has a structure in which an image is formed once in an adapter and then relayed by a relay optical system to be re-imaged on an image sensor in a television camera.

  At this time, if a prism having the same optical path length as the prism (color separation prism) in the TV camera is arranged in the optical path before image formation once, the existing photographing lens is in an optimal state in consideration of aberrations and the like. An image can be formed.

  As the prism arranged in the optical path before the image formation, there is no problem in terms of performance as long as the prism has the same optical path length as the prism (color separation prism) in the television camera, but the space for arranging this prism In the case of the adapter as in the present invention, there is a problem that the adapter becomes large.

  As described above, if considered simply, there is no problem in terms of performance if a prism before imaging once, an odd-number reflection prism for rotating the subject, and an odd-number reflection prism for returning the back image to the front image are arranged. The problem that the adapter becomes large still remains.

  The present invention also solves the problem that the adapter as described above is increased in size by combining the prism before imaging once and the odd-number reflection prism that returns the back image to the front image.

  In the image rotation adapter 16 of the above embodiment, the optical path length of the first prism 42 is set to be the same as the optical path length of the color separation prism 52 in the TV camera 12, but the optical path length of the first prism 42. The optical path lengths of the color separation prisms 52 in the television camera 12 do not necessarily need to be completely matched, and can be set to a close value within an allowable range. That is, the optical path length of the first prism 42 is preferably the same as the optical path length of the prism installed in the television camera, but a good image can be taken without any problem as long as it is within a range of about ± 5 mm. Can do. Preferably, it is set within a range of about ± 2 mm with respect to the optical path length of the prism installed in the television camera.

  Further, it is preferable to use the same material as the prism installed in the television camera 12 as the material of the first prism 42, but it is not always necessary to use the same material, and the same function and effect can be obtained. If so, other materials can be used.

  Moreover, in the said embodiment, although the 1st prism 42 and the 2nd prism 44 are comprised by the Pechan prism, the prism which comprises the 1st prism 42 and the 2nd prism 44 is not limited to this. . That is, a prism having another configuration may be used as long as it is configured to reflect the incident light an odd number of times to invert and emit the image. In this case, the second prism 44 is configured so that the incident optical axis and the outgoing optical axis are coaxially arranged. However, for the first prism 42, at least the incident optical axis and the outgoing optical axis are parallel. Any configuration is acceptable. Further, the first prism 42 and the second prism 44 do not necessarily need to use prisms having the same configuration.

  FIG. 6 is a diagram showing an example of a prism configured to invert an image by reflecting the incident light an odd number of times and to output the inverted image.

  FIG. 4A shows a prism (so-called dove prism) configured to invert an image by reflecting incident light once and to output the inverted image. The light incident on the surface C1 is reflected from the surface C2, and then emitted from the surface C3.

  FIG. 5B shows a prism configured to invert an image by reflecting incident light three times and to output the inverted image. The light incident on the surface D1 is reflected by the surface D2, the surface D3, and the surface D4 and then emitted from the surface D5.

  FIG. 5C shows a prism configured to invert an image by reflecting incident light five times and to output the inverted image. The light incident on the surface E1 is reflected by the surface E2, the surface E1, the surface E3, the surface E5, and the surface E4 and then emitted from the surface E5.

  FIG. 4D shows a prism having a structure in which three triangular prisms are bonded together. The incident light is reflected three times to invert and output the image. The light incident on the surface F1 is reflected by the surface F2, the surface F3, and the surface F4 and then emitted from the surface F5. In the prism configured as described above, the optical axis of the light incident on the surface F1 and the optical axis of the light emitted from the surface F5 are parallel to each other, but are not positioned coaxially. Therefore, the prism having the configuration can be used only for the first prism 42.

  Note that the prism used for the first prism 52 does not necessarily have the incident optical axis and the outgoing optical axis positioned on the same axis. Moreover, it does not necessarily need to be parallel. That is, the first prism 52 only needs to be configured to reflect light an odd number of times.

  In this way, any prism may be used as long as it is configured to reflect the incident light an odd number of times to invert and emit the image.

  However, in consideration of downsizing of the apparatus, it is preferable to use a prism configured to reflect and output at least three times inside. In other words, the total length of the prism in the optical axis direction can be shortened by reflecting and outputting a plurality of times, and thus the total length of the image rotation adapter 16 can be shortened.

  In particular, since the optical path length of the first prism 42 needs to be the same as the optical path length of the color separation prism 52, in order to reduce the size of the apparatus while satisfying this requirement, at least three times or more. It is preferable to use a prism configured to reflect and output.

  Hereinafter, the rotational drive control of the second prism 44 in the present embodiment will be described with reference to the flowcharts of FIGS.

  First, in step S100 in FIG. 7, initial values of various variables are set to predetermined values.

  Next, in step S102, it is determined whether or not the right rotation button R has been pressed. If it is determined that the right rotation button R is pressed, it is determined in step S104 whether the second prism 44 is rotating right. At this time, the rotation direction is determined by the microcomputer 70 based on a detection signal from the encoder 74.

  If the right rotation button R is being rotated, the right rotation button R has already been pressed once, and the right rotation button R has been pressed again. As described above, in the present embodiment, the rotation start and the rotation stop are controlled by the same button. Therefore, when the right rotation button R is pressed during the right rotation, the right rotation is stopped. It will be.

  Therefore, in the next step S106, a signal is output from the microcomputer 70 toward the prism rotation drive motor 68 so that the output value of the D / A 72 becomes 0 (out = 0).

  On the other hand, if it is determined in step S104 that the rotation is not to the right, that is, the rotation is to the left, in step S108, the output value (out) of D / A 72 is set to x in order to perform the right rotation. . That is, out = x. Here, the output “out” of the D / A 72 gives the rotational speed of the prism rotation drive motor 68, which is changed by adjusting the speed adjustment volume 84, and this is expressed by a variable x. To do.

  In either case, the process returns to step S102.

  Next, if it is determined in step S102 that the right rotation button R has not been pressed, it is determined in step S110 whether the left rotation button L has been pressed. If it is determined that the left rotation button L is pressed, it is determined in step S112 whether the second prism 44 is rotating left. The direction of rotation is determined by the microcomputer 70 based on a detection signal from the encoder 74.

  If the left rotation button L is being rotated, the left rotation button L has already been pressed once and the left rotation button L has been pressed again when the left rotation is being performed. The left rotation will be stopped.

  Therefore, in the next step S114, a signal is output from the microcomputer 70 toward the prism rotation drive motor 68 so that the output value of the D / A 72 becomes 0 (out = 0).

  On the other hand, if it is determined in step S112 that the rotation is not to the left, that is, the rotation is to the right, in step S116, the output value (out) of D / A 72 is set to out = -X.

  If it is determined in step S110 that the left rotation button L has not been pressed, it is next determined in step S118 whether or not the shot button 82a has been pressed. If it is determined that the shot button 82a is pressed, the second prism 44 rotates as follows to the shot position (target value 1) set in advance for the shot button 82a. It is controlled to stop (execution of preset).

  That is, first, in step S120, it is determined whether or not the second prism 44 is rotating. If not, the process proceeds to the flowchart of FIG. On the other hand, if it is rotating, in the next step S122, it is determined whether the rotation is clockwise or counterclockwise. As described above, the rotation direction and the current value are determined by the microcomputer 70 based on the detection signal from the encoder 74.

  In the case of the right rotation, in the next step S124, the target value 1 for rotating the second prism 44 is compared with the current value.

  In this embodiment, one rotation (0 ° to 360 °) is represented by a digital value from 0 to 4095, and the rotation direction and position of the second prism 44 are detected and controlled. The angle is measured counterclockwise as usual, and the rotation direction of the second prism 44 is clockwise rotation (positive rotation) clockwise rotation, and left rotation (negative rotation) counterclockwise. Rotate around.

  In step S124, when the current value of the second prism 44 is larger than the target value 1, the current value is rotated right, so that the second prism 44 is rotated right as it is and the angle at which the second prism 44 rotates from the current position to the target position. Is (current value−target value 1). Therefore, in step S126, a = (current value−target value 1) × g. Here, g is a gain.

  On the other hand, if the target value 1 is larger than the current value in step S124, the angle at which the second prism 44 rotates rightward and rotates from the current position to the target position is one rotation (360 ° in terms of angle, digital The value is 4095, that is, the maximum value) minus (target value 1−current value). Therefore, in step S128, a = {maximum value− (target value 1−current value)} × g = (maximum value + current value−target value 1) × g. Note that g is a gain.

  Next, in step S130, the value just calculated is compared with the motor rotation speed x (rotation angle per unit time) adjusted by the speed adjustment volume 84.

  If the comparison result in step S130 shows that a is larger than x, the output value (out) of the D / A 72 is set to x in step S132. That is, out = x. If a is not greater than x, the output value (out) of D / A 72 is set to a in step S134. That is, out = a.

  Then, the second prism 44 is rotated to the right as it is. In step S136, it is determined whether or not the current value matches the target value 1. If not, the process returns to step S124 to continue the preset operation, and the current value. Is equal to the target value 1, the preset operation is terminated and the process returns to step S102.

  If it is determined in step S122 that the rotation is to the left, the process proceeds to step S138, and the same control as in the case of the right rotation in steps S124 to S136 described so far is performed.

  That is, first, in step S138, the target value 1 is compared with the current value. When the current value is larger than the target value 1, the rotation is now counterclockwise, and therefore the rotation angle when the second prism 44 is rotated counterclockwise from the current position to the target position is from one rotation (current value−target value). It is a value obtained by subtracting 1). In step S140, a = − {(maximum value−current value + target value 1) × g}.

  On the other hand, if the current value is not larger than the target value 1, the angle from which the current value is rotated to the left and rotated from the current position to the target position is the target value 1−current value, which is now a left rotation. In step S142, a = (current value−target value 1) × g.

  Next, in step S144, -x and a are compared. If a is larger than -x, the output value (out) of D / A 72 is set to -x in step S146. That is, out = −x. If a is not larger than -x, the output value (out) of D / A 72 is set to a in step S148. That is, out = a.

  In step S150, it is determined whether or not the current value matches the target value 1. If the current value does not match, the process returns to step S138. If the current value matches, the process returns to step S102.

  When the preset is executed by pressing the shot button 82a while the second prism 44 is rotating, the control of the second prism 44 is switched from the speed control until then to the position control, and the second prism 44 is rotated to the target position. And controlled to stop. At this time, it is preferable not to change the rotation speed even if the preset is executed during the rotation. As a result, it is possible to obtain an image that does not give a sense of incongruity because there is no speed change even if preset is executed during rotation.

  On the other hand, if it is determined in step S120 that the second prism 44 is not rotating, that is, is stopped, the control of the flowchart of FIG. 8 is performed.

  The flowchart of FIG. 8 shows control when the shot button 82a is pressed while the second prism 44 is stopped.

  In this case, first, in step S154, for the position of the second prism 44 immediately after the shot button 82a is pressed while the rotation is stopped, the current position of the second prism 44 and the shot position set in the shot button 82a ( It is determined whether or not the distance from the target value 1) is larger than half of one rotation. This is to determine the shortest distance when rotating from the current position to the target position. One rotation (0 ° to 360 °) was previously represented as a digital value 0 to 4095. According to this, a half circumference corresponding to 180 ° is represented as a digital value 2047. This is called the center value. In step S154, it is determined whether or not the absolute value of the difference between the current value and the target value 1 is greater than the center value. The angle indicating the current value and the target value 1 is represented as 0 to 4095 as a digital value from 0 ° to 360 °. For easy understanding, for example, when the target value 1 is 300 ° and the current value is 60 °. The absolute value of the difference between the current value and the target value 1 is 240, which is larger than 180 ° corresponding to the center value.

  If the absolute value of the difference between the current value and the target value 1 is not greater than the center value as a result of the determination in step S154, 0 is sandwiched between the current position of the second prism 44 and the shot position (target value 1). The interval on the non-existing side is equal to or less than half a circle.

  On the other hand, when the absolute value of the difference between the current value and the target value 1 is larger than the center value, the interval between the current position of the second prism 44 and the shot position (target value 1) on the side where 0 is not sandwiched is half a circle. It will be bigger. In the next step S156, the current value is compared with the target value 1. If the current value is not larger than the target value 1, the process proceeds to the flowchart of FIG.

  If it is determined in step 156 that the current value is larger than the target value 1, the process proceeds to step S166.

  If it is determined in step S156 that the current value is larger than the target value 1, the interval between the current position of the second prism 44 and the shot position (target value 1) on the side where 0 is not sandwiched is larger than a half circumference. Therefore, the interval between the current position of the second prism 44 and the shot position (target value 1) on the side of 0 is smaller, and this is the difference between the current position of the second prism 44 and the shot position (target value 1). The shortest distance. Therefore, in step S158, a value obtained by subtracting the difference between the current value and the target value 1 from the maximum value (digital value 4095 indicating one round) and multiplying by the gain g is a. That is, a = − {(maximum value−current value + target value 1) × g}.

  Then, in step S160, a and -x are compared. If a is larger, the output of D / A is set to out = a in step S162, while if a is not larger. In step S164, the output of the D / A is set to out = −x. Then, the process proceeds to step S186.

  If the current value is not larger than the target value 1 in step S156, the value obtained by subtracting the difference between the target value 1 and the current value from the maximum value and the gain g in step S166 is the value of a. Calculate as That is, a = (maximum value + current value−target value 1) × g.

  Then, in step S168, a and x are compared. If a is larger, the output of D / A is set to out = x in step S170, and if a is not larger, step a is step. In S172, the D / A output is set to out = a. Then, the process proceeds to step S186.

  If the absolute value of the difference between the current value and the target value 1 is not larger than the center value in step S154, a = (current value−target value 1) × g is set in step S174. However, g is a gain.

  Next, in step S176, a and x are compared. If a is larger, the output of D / A 72 is set to out = x in step S178.

  In step S176, if a is not larger than x, in step S180, a is compared with -x. If -x is greater than a, the output of D / A 72 is set to out = -x in step S182. If -x is not greater than a, the output of D / A 72 is output in step S184. = A.

  In step S186, it is determined whether the current value matches the target value 1. If the current value matches the target value 1, the shot function (preset) ends, and the process returns to step S102 in the flowchart of FIG. On the other hand, if the current value still does not match the target value 1, the process returns to step S154 and continues control.

  In this way, when executing the preset while the prism is stopped, the position control is performed so as to rotate in the direction of the shortest distance and stop at the target position.

  For convenience of explanation, one shot button is used and one preset is used. However, when a plurality of presets such as SHOT1, SHOT2,... Are provided, one preset is executed. It is preferable that the system is switched to execution of other presets when other presets are sometimes executed.

  If it is determined in step S118 in the flowchart of FIG. 7 that the shot button 82a has not been pressed, it is determined in step S152 whether or not the forced erect button 80a has been pressed.

  As a result, when the forced erection button 80a is not pressed, the process proceeds to the flowchart showing the control in the case of forced erection OFF in FIG. 9, and when the forced erection button 80a is pressed, FIG. Proceed to the flowchart showing the control in the case of forced upright ON.

  If the forced erecting button 80a is not pressed in step S152 of FIG. 7, that is, if it is determined that forced establishment is OFF, forced erecting OFF control is performed according to the flowchart of FIG. That is, in step S212 in FIG. 9, it is determined whether or not the shot position setting button (SHOT1MEMO) 82b has been pressed. If the shot position setting button 82b has been pressed, the current value is set to the target value 1 as the shot position in step S214. The set target value 1 is stored in the memory 88.

  On the other hand, if the shot position setting button 82b has not been pressed, it is determined in the next step S216 whether the forced erect position setting button (forced erecting MEMO) 80b has been pressed. If the forced erect position setting button 80b has been pressed, the current value is set to the target value 2 as the forced erect position in step S218. The set target value 2 is stored in the memory 88.

  In this way, the forced upright position can be rewritten. At this time, it is preferable that the rewriting of the forced erect position is more difficult to rewrite than when the shot position is set.

  If the forced erect position setting button 80b has not been pressed, the process returns to step S102 in the flowchart of FIG.

  If the forced erecting button 80a is pressed in step S152 of the flowchart of FIG. 7, that is, if it is determined that the forced establishment is ON, the forced erecting ON control is performed according to the flowchart of FIG.

  In the case of forced erect ON, that is, when the forced erect button 80a is pressed, the second prism 44 is forcibly rotated to a preset erect position. For this purpose, in step S220, the value a is calculated as the difference between the current value and the target value 2 multiplied by the gain g. In step S222, the value of a is set as out = a as the output of D / A.

  In step S224, it is determined whether the current value matches the target value 2. If the current value matches the target value 2, it means that the upright position has been reached, and therefore the forced upright control is terminated, and the process returns to step S102 in the flowchart of FIG. If the current value does not yet match the target value 2, the process returns to step S220, the value a is calculated again, and the control is continued.

  It should be noted that it is preferable to rotate the prism at the maximum speed during forced erection execution.

  As described above, in the present embodiment, a preset (shot position) is set, a position where the second prism 44 is to be stopped is stored in advance, and when preset is executed, the control is switched to position control, and the rotational speed at that time Can be adjusted by the speed adjustment volume 84, when the image is rotated by rotating the second prism 44, it is possible to smoothly stop at a target position when it is desired to rotate from a certain angle to a certain angle. .

  Further, when a preset (shot function) is executed while the optical system is stopped, the position is controlled so as to rotate in the direction of the shortest distance and stop at the target position. Further, when preset is executed while the optical system is rotating, the control is switched from the speed control to the position control, and is rotated to the target position while maintaining the rotation direction and stopped.

  In the above embodiment, one shot button and one preset position are described. However, it is preferable to provide a plurality of presets.

  In the case where a plurality of presets are provided, it is preferable to switch to a preset executed later when another preset is executed while one preset is being executed.

  In the above embodiment, as described with reference to the flowchart of FIG. 11, the forced erect position can be rewritten, and the forced erect position is not fixed but is stored as a kind of preset. At this time, when the forced upright position is rewritten, as described above, it is preferable to rewrite it more easily than other presets.

  Further, it is preferable to move at the maximum speed during forced upright execution. In the present embodiment, the rotation of the prism is basically defined by the speed adjustment volume, but it is moved at the maximum speed when moving to the forced erect position. At this time, instead of moving to the forced erection position at the maximum speed, it may be moved at the speed of the speed adjustment volume, or these may be switched.

  Also, even if the preset is executed when the right rotation button R or the left rotation button L is pressed to rotate the prism, it rotates to the target position at the same rotation speed as before and the rotation speed does not change. ing. This is basically to move at the speed adjusted by the speed adjustment volume, and to prevent a sense of incongruity due to the preset being executed and the speed changing when the prism is rotating at a certain speed.

  Further, it is preferable that the rotation speed can be adjusted with the speed adjustment volume when the prism is rotated by pressing the right rotation button R or the left rotation button L, or during preset execution.

  Although the image rotation adapter of the present invention has been described in detail above, the present invention is not limited to the above examples, and various improvements and modifications may be made without departing from the spirit of the present invention. Of course.

It is a system configuration figure of a television camera system. It is a schematic block diagram of the optical system of a television camera system. It is the schematic which shows schematic structure of one Embodiment of the adapter for image rotation. It is a schematic block diagram of a 1st prism (2nd prism). It is a block diagram which shows the outline of the rotational drive control system which rotates a 2nd prism around an optical axis. It is a figure which shows an example of the prism which can be used. It is a flowchart which shows the whole flow of the rotational drive control of the 2nd prism in this embodiment. It is a flowchart which shows the control which performs a preset during the 2nd prism stop. It is a flowchart which shows the flow which sets a target position and a forced erect position. It is a flowchart which shows forced upright control.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Television camera system, 12 ... Television camera, 12A ... Camera body, 14 ... Shooting lens, 16 ... Image rotation adapter, 18 ... Lens side mount, 20 ... Camera side mount, 22 ... Rear side mount, 24 ... Front side mount 30 ... lens barrel, 32 ... focus lens, 34 ... zoom lens, 36 ... iris, 38 ... relay lens, 40 ... case, 42 ... first prism, 44 ... second prism, 46 ... first relay lens, 48 ... second relay lens, 52 ... color separation prism, 54R, 54G, 54B ... imaging device, 60 ... prism holding frame, 62 ... bearing, 64 ... gear, 66 ... drive gear, 68 ... prism rotation drive motor, 70 ... microcomputer 72 ... D / A, 74 ... encoder, 76 ... counter, 80a ... forced erection button, 80b ... forced erection position setting button Emissions, 82a ... shot button, 82b ... shot position setting button, 84 ... speed adjusting volume, 86 ... A / D, 88 ... memory

Claims (5)

For a camera in which a photographic lens is detachably attached to the camera body, and a subject image that has passed through the photographic lens is imaged on a light receiving surface of an image sensor via a prism built in the camera body. An image rotation adapter that is detachably mounted between a photographic lens and the camera body, and rotates a subject image formed on a light receiving surface of the image sensor,
It is formed with an optical path length close to the prism built in the camera body, and is disposed in the optical path before the subject image that has passed through the photographing lens is formed at a predetermined position in the image rotation adapter, and the photographing A first prism that reflects the subject light that has passed through the lens an odd number of times and inverts the subject image that has passed through the photographing lens;
An incident optical axis and an outgoing optical axis are formed on the same axis, and are disposed on the optical axis of the subject light after passing through the first prism and once imaged, and are rotatably supported around the optical axis. A second prism that reflects the subject light that has passed through the first prism an odd number of times and further inverts the subject image inverted by the first prism;
A relay optical system for re-imaging the subject image that has passed through the second prism on the light receiving surface of the image sensor;
Rotation driving means for rotating the second prism;
Control means for controlling the rotation driving means;
Rotation instruction means for instructing the control means to start and stop rotation driving;
Target position setting means for presetting at least one target position to stop the second prism;
Preset instruction means for instructing the control means to execute a preset for moving the second prism to the target position;
Speed adjusting means for adjusting the rotational speed of the second prism;
Detecting means for detecting a rotational position and a rotational direction of the second prism;
When the execution of the preset is instructed, the control means performs position control so that the second prism is moved to the target position by the rotation driving means using the detection result of the detection means, An image rotation adapter characterized in that the rotation speed when the second prism moves to the target position can be adjusted by the speed adjusting means.   2. The image rotation adapter according to claim 1, wherein when the execution of the preset is instructed while the second prism is stopped, the control means rotationally drives the second prism in the direction of the shortest distance. Position control to stop at the target position, and when the execution of the preset is instructed while the second prism is rotating, the control means maintains the rotation direction of the second prism while maintaining the rotation direction of the second prism. An image rotation adapter, wherein position control is performed to stop the two prisms at the target position.   3. The image rotation adapter according to claim 1, wherein when the preset is executed while the second prism is rotating, the control unit does not change a rotation speed of the second prism. An image rotation adapter characterized by performing control.   4. The image rotation adapter according to claim 1, wherein the speed adjustment unit is capable of adjusting a rotation speed of the second prism while the second prism is rotating or during execution of the preset. 5. An image rotation adapter characterized by that.   5. The image rotation adapter according to claim 1, wherein the control is further performed to forcibly erect the second prism to an erect position where the subject erects. Forcibly erecting instructing means, and erecting position setting means for presetting the erecting position, and when the forced erecting is instructed, the control means moves the second prism to the erecting position. An image rotation adapter characterized by performing position control so as to be moved to a position and rewriting the forced erect position.

Images