JP4374763B2 - TV lens device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a television lens apparatus, and more particularly, to a television lens apparatus used in combination with an optical shift type image stabilization unit including an image stabilization lens that corrects image blur caused by vibration applied to a camera.
[0002]
[Prior art]
In the field of television cameras, a method for enlarging an image magnification by inserting an extender lens into a photographing optical system is conventionally known. Japanese Patent Application Laid-Open No. 63-201624 discloses an extender lens incorporating an image stabilizer (image blur correction device). By inserting an extender optical system, image enlargement and simultaneous image blurring are performed. Prevention is realized.
[0003]
Japanese Patent Laid-Open No. 6-230279 discloses a zoom lens used for a television camera capable of switching the aspect ratio of an effective imaging surface. This zoom lens has a conversion lens group that prevents a change in the angle of view and a change in image plane position caused by switching of the aspect ratio, and this conversion lens group is incorporated on the turret of the built-in extender.
[0004]
Japanese Patent Application Laid-Open No. 6-189181 discloses an intermediate adapter (anti-vibration unit) that is detachably mounted between a camera and a lens device. This intermediate adapter is provided with a variable apex angle prism corresponding to an anti-vibration lens, a shake detection sensor, a variable apex angle prism drive circuit, and the like, and based on the shake information detected by the shake detection sensor, the variable apex angle prism The drive circuit moves the variable apex angle prism to decenter the optical axis, thereby correcting image blur. Japanese Patent Application Laid-Open No. 11-284900 also discloses a vibration isolator (anti-vibration unit) that controls the movement of a movable lens in accordance with detected vibration to prevent image blur.
[0005]
[Problems to be solved by the invention]
When the optical shift type image stabilization unit as described above is used, the image formation size changes due to the action of the lens built in the unit. For example, if an anti-vibration unit having a magnification of 1.25 times is attached to a TV lens that is characterized by wide-angle performance, the focal length is enlarged by 1.25 times compared to a state in which no anti-vibration unit is attached. As a result, the wide side becomes narrow and the original performance of the lens cannot be secured.
[0006]
The present invention has been made in view of such circumstances, and provides a television lens device capable of obtaining an image formation size equivalent to a state in which the image stabilization unit is not mounted even when the image stabilization unit is mounted. With the goal.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a television lens apparatus in which an image stabilization unit having an image stabilization lens that corrects image blur caused by vibration applied to the camera is detachably mounted. A correction lens system having a magnification conversion function that cancels an enlargement magnification caused by the action of a lens group incorporated in the image stabilization unit; When an anti-vibration unit with a magnification is installed, By arranging the correction lens system on the photographic optical axis and canceling out the magnification of the image stabilization unit in combination with the image stabilization unit and the correction lens system, Equivalent image size when the image stabilization unit is not installed Get It is characterized by that.
[0008]
According to the present invention, when the image stabilization unit is mounted, the correction lens system having a magnification conversion function that cancels the magnification due to the function of the image stabilization lens incorporated in the image stabilization unit is arranged on the photographing optical axis. To do. As a result, an image magnification equivalent to that when the image stabilization unit is not mounted is achieved.
[0009]
According to an aspect of the present invention, the television lens device includes an extender optical system that converts an imaging magnification, and the correction lens system is incorporated in an extender switching device that switches the extender optical system. Yes. In this case, it is preferable that the extender switching device incorporate a plurality of correction lens systems having different magnifications corresponding to each extender magnification.
[0010]
According to another aspect of the present invention, in addition to the above-described configuration, a mounting determination unit that detects whether or not a vibration isolation unit is mounted, and a case where the mounting determination unit detects the mounting of the vibration isolation unit And a control means for operating the extender switching device so that the correction lens system is automatically inserted on the photographing optical axis.
[0011]
According to the television lens device of this aspect, the installation of the image stabilization unit is automatically determined, and when the unit is installed, a necessary correction lens system is automatically inserted on the photographing optical axis, so that no special operation is required. .
[0012]
According to still another aspect of the present invention, in the television lens device having the above-described configuration, an instruction to select a state in which the correction lens system is inserted on the photographing optical axis and a state in which the correction lens system is retracted from the photographing optical path is provided. It is characterized by having a selection means for giving. As described above, it is preferable that the correction lens system can be freely inserted / retracted according to the intention of the cameraman.
[0013]
The correction lens system may be configured as an external unit that can be attached to and detached from the front (front lens side) or the rear (rear lens side) of the television lens device, in addition to the mode incorporated in the lens device as described above. .
[0014]
In the television lens device of the present invention, it is also preferable that a display unit is added to indicate that the correction lens system is inserted on the photographing optical axis. In addition, it comprises a remote control operation means for generating at least one command signal among a command signal for inserting the correction lens system on the photographing optical axis and a command signal for retracting the correction lens system from the photographing optical axis, A mode in which insertion / retraction of the correction lens system can be remotely controlled is also preferable.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of a television lens apparatus according to the present invention will be described with reference to the accompanying drawings.
[0016]
1 and 2 show a television camera device 12 to which an optical shift type image stabilization unit 10 is attached. The television camera device 12 is a device that can perform a zoom operation and a focus operation by a single-axis two-operation method, and includes an EFP lens device (hereinafter referred to as a lens device) 14, an image stabilization unit 10, and a camera body. 16 is mainly configured.
[0017]
The camera body 16 is detachably attached to a pan / tilt head 20 provided on the top of a tripod or pedestal 18. The operation rod 22 is detachable from the lens device 14 and is disposed through the camera body 16 and the vibration isolation unit 10. The operation rod 22 is passed through an operation rod insertion hole 16 </ b> A formed in the camera body 16, and the distal end portion of the operation rod 22 is connected to a lens driving unit (not shown) of the lens device 14.
[0018]
The cameraman can perform a zoom operation by grasping the grip 23 of the operation bar 22 and pushing and pulling the operation bar 22 while watching the image displayed on the viewfinder 24 installed on the upper part of the camera body 16. Further, the focus adjustment can be performed by rotating the grip 23 and rotating the operation rod 22.
[0019]
A zoom rate demand 26 and a focus position demand 28 can be installed on the pan / tilt rods 25A, 25B extending from the camera platform 20. The photographer can perform a zoom operation by rotating the thumb ring 26A of the zoom rate demand 26 with a thumb, and can perform a focus operation by rotating the focus knob 28A of the focus position demand 28.
[0020]
The zoom rate demand 26 outputs a zoom speed command signal for instructing the zoom speed according to the operation direction and the operation amount of the thumb ring 26A, and the focus position demand 28 commands the focus position according to the rotational position of the focus knob 28A. A focus position command signal is output. These command signals are transmitted to the lens device 14 via the cables 26B and 28B.
[0021]
When a controller such as a zoom rate demand 26 or a focus position demand 28 and an operation rod 22 are provided together, a lens operation method using the operation rod 22 and a lens operation method using the zoom rate demand 26 or the focus position demand 28 are switched. Switching means is provided, and an operation method can be selected by the switching means. A mode in which the movement of the operation rod 22 is electrically detected to servo-drive zoom and focus is also possible. The operation rod 22 is also used as a manual operation method and a servo operation device, and the role of the operation rod 22 is switched by the switching device. It is also possible to switch. Such a manual / servo operating device has been proposed by the present applicant (Japanese Patent Application No. 11-138616). Of course, when a controller such as the zoom rate demand 26 or the focus position demand 28 is used, a mode in which the operation bar 22 is omitted is also possible.
[0022]
FIG. 3 is a configuration diagram of an optical system of the television camera device 12. The lens device 14 includes a focus lens group 30, a variable power lens group 32, an aperture 34, an extender mechanism 36, and a relay lens group 38 in order from the front of the photographing optical axis L. The image stabilization unit 10 includes a first fixed lens 40, a movable lens 42 and a second fixed lens 44.
[0023]
This anti-vibration unit 10 is an adapter that can be attached to and detached from the lens device 14 as necessary when the TV camera device 12 is used on an outdoor sports broadcast or on an unstable scaffold, as shown in FIG. The lens device 14 and the camera body 16 are mounted. When a handy camera is used, a lens supporter (not shown) is used, and the image stabilization unit 10 and the lens device 14 or the image stabilization unit 10 and the camera body 16 are connected via the lens supporter. For example, as shown in Japanese Laid-Open Patent Application No. 11-284900, the rear surface of the image stabilization unit 10 is connected to the front surface of the lens supporter, and the bayonet mount of the image stabilization unit is connected to the camera via the lens supporter. There is also an aspect in which the front surface of the image stabilization unit is connected to the rear surface of the lens supporter, and the bayonet mount of the image stabilization unit is directly connected to the camera.
[0024]
Subject light incident through the lens device 14 is separated into R (red), G (green), and B (blue) color components by a color separation prism 50 in the camera body 16. The subject light separated into each color component is converted into an electrical signal by an image sensor such as a CCD 52, 53, or 54, respectively. The signals output from the CCDs 52, 53, 54 are processed by a known image signal processing means, and an image of the subject image is displayed on the television screen.
[0025]
When subject light is incident on the dichroic film 50A of the color separation prism 50 at an incident angle equal to or greater than a predetermined angle, white shading occurs, so that the exit pupil position of the TV lens is determined to prevent such a problem. It is necessary to satisfy the conditions.
[0026]
In order to bring the exit pupil position when the image stabilization unit 10 is mounted closer to the exit pupil position when the unit is not mounted, the image stabilization unit 10 side must be at an enlargement magnification. The anti-vibration unit 10 of this example has an enlargement magnification of 1.25 times by the action of the anti-vibration lens group 46 including the first fixed lens 40, the movable lens 42 and the second fixed lens 44. The enlargement factor (1.25 times) of the focal length is appropriately changed according to the thickness dimension of the image stabilization unit 10.
[0027]
FIG. 4 is a front view of the turret 60 of the extender mechanism 36. As shown in the figure, the turret 60 is provided with four types of conversion lenses 62, 64, 66, and 68, which are 1 ×, 2 ×, 0.8 ×, and 1.6 ×. The turret 60 is supported so as to be rotatable about a shaft 70, and any one conversion lens can be disposed on the photographing optical axis L by rotating the turret 60.
[0028]
FIG. 5 shows a correspondence table of image magnifications. There are two standard extender lenses built into the TV lens: “1x” and “2x”, and the aspect ratio of the effective imaging surface can be switched between “16: 9” and “4: 3”. In the case of a TV lens device that can be used for a simple camera, a ratio converter of “0.8 times” is provided.
[0029]
When the image stabilization unit 10 having an enlargement magnification of 1.25 times is attached to such a television lens, the image magnification is 1.25 times or 2.5 times depending on the type of conversion lens (extender lens or ratio converter) used. Or 1 time.
[0030]
In order to achieve each image magnification of 1 ×, 2 ×, and 0.8 × with the image stabilization unit 10 mounted, the magnification correction optical system is 0.8 ×, 1.6 ×, and 0.64 ×. Correction lens is required. In the example shown in FIG. 3, the 1.6 × conversion lens 68 is provided as the correction lens, but a mode in which a 0.64 × conversion lens is added is also possible. The 0.8 × conversion lens 66 functions as a ratio converter for aspect ratio conversion and is also used as a magnification correction lens for the image stabilization unit 10.
[0031]
FIG. 6 is a block diagram showing the main configuration of the lens device 14 and the image stabilization unit 10 according to the present embodiment. The lens device 14 includes an extender switching drive unit 72 that rotationally drives the turret 60, an extender discriminating device 74 that discriminates the type of the selected conversion lens, and an anti-vibration unit 10 that detects whether or not the image stabilizing unit 10 is mounted. A vibration unit attachment discriminating device 76, a display device 78 for displaying the current lens state, and a control circuit 80 for controlling each circuit unit are provided.
[0032]
The extender switching drive unit 72 includes a motor (not shown) and a rotational position detection sensor, and operates based on a control signal from the control circuit 80. When the turret 60 is rotated by the power of the extender switching drive unit 72, a desired conversion lens is arranged on the photographing optical axis L.
[0033]
The extender discriminating device 74 includes means for detecting the rotational position of the turret 60 (for example, a photo interrupter or a micro switch). A detection signal (discrimination signal) of the extender discriminating device 74 is sent to the control circuit 80, and the control circuit 80 grasps the magnification of the conversion lens currently arranged on the photographing optical axis L based on the discrimination signal.
[0034]
For example, a pressure sensitive contact or a sensor such as a photo interrupter can be used as the vibration isolation unit mounting determination device 76. Further, instead of such a sensor, an answer signal of the CPU 90 that controls the image stabilization mechanism 84 of the image stabilization unit 10 may be used.
[0035]
The control circuit 80 generates a control signal (operation control signal) for operating the extender switching drive unit 72 based on a switching signal received from the extender switching signal generating unit 92 (corresponding to the extender switching switch 200 shown in FIG. 17). Output. The extender switching signal generating means 92 may be provided in a controller such as the zoom rate demand 26 or may be provided in an operation unit on the camera side.
[0036]
The control circuit 80 controls a lens driving unit and an iris driving unit (not shown) to control the driving of the focus lens 30, the variable power lens 32, and the diaphragm 34, and receives a determination signal received from the extender determination device 74. Based on the mounting signal received from the image stabilization unit mounting discriminating device 76, a control signal for displaying information indicating the lens state on the display device 78 is output, and display control of the display device 78 is performed.
[0037]
On the other hand, the vibration isolation unit 10 includes a sensor (for example, an angular velocity sensor) 96 that detects vibration, a vibration isolation mechanism 84 that moves the movable lens 42 in a plane orthogonal to the imaging optical axis L, and a detection signal of the angular velocity sensor 96. And a CPU 90 for controlling the vibration isolation mechanism 84 based on the above.
[0038]
The CPU 90 calculates a correction movement amount in the horizontal direction and the vertical direction to be given to the movable lens 42 based on the detection signal received from the angular velocity sensor 96, and moves the movable lens 42 by the correction movement amount indicated by the calculation result. Is output.
[0039]
The vibration isolation mechanism 84 includes a linear motor 100, a position sensor 102, and an amplifier 104. The command signal output from the CPU 90 is amplified by the amplifier 104 and then output to the linear motor 100. The linear motor 100 operates to extend or contract the rod by an amount corresponding to a command signal from the CPU 90, and moves the movable lens 42 to the image blur correction position. Thereby, the vibration components in the vertical direction and the horizontal direction are canceled by the movement of the movable lens 42, and the image blur is suppressed.
[0040]
The position sensor 102 detects the moving position of the movable lens 42. The position signal detected by the position sensor 102 is compared with a signal indicating the corrected movement amount output from the CPU 90, and a signal corresponding to the comparison result is output from the amplifier 104. Thus, the linear motor 100 is feedback-controlled so that the movable lens 42 is positioned at a position corresponding to the correction movement amount commanded by the CPU 90.
[0041]
When the image stabilization unit 10 is connected to the lens device 14, information such as focal length information and information (extender information) indicating the extender magnification is supplied from the lens device 14 side to the image stabilization unit 10 side. The CPU 90 of the image stabilization unit 10 performs calculations related to the control of the movable lens 42 based on the information obtained from the lens device 14 side.
[0042]
FIG. 7 is a diagram illustrating a display example on the display device 78. As shown in FIG. 2A, the display device 78 is provided on the side surface of the lens device 14. As shown in FIG. 5B, the display device 78 displays the display unit 110 indicating whether or not the image stabilization unit 10 is mounted, the display unit 112 indicating whether or not the correction lens system is used, and magnification information by the extender. Display portions 114, 115, and 116. A light emitting diode (LED) (not shown) is disposed behind each display unit 110, 112, 114, 115, 116, and the light emission of the LED is controlled by the control circuit 80. When the image stabilization unit is mounted, the LED of the display unit 110 is lit and the letters “image stabilization unit” are displayed. In addition, when the correction lens system is used in the state where the image stabilization unit is mounted, the LED of the display unit 112 is turned on and the characters “correction lens system” are displayed.
[0043]
The display units 114, 115, and 116 that display the magnification information of the extender display the respective magnification displays of 1 ×, 2 ×, and 1.6 ×, respectively. When the anti-vibration unit is mounted, the LEDs of the display units 114, 115, or 116 corresponding to the image magnification by the combination of the conversion lens 62, 64, 66, or 68 of the extender mechanism 36 and the anti-vibration lens group 46 are turned on, and the anti-vibration unit is turned on. When the vibration unit is not attached, the LED of the display unit 114, 115, or 116 corresponding to the image magnification by the conversion lens 62, 64, 66, or 68 of the extender mechanism 36 is lit.
[0044]
For example, when the 1.6 × conversion lens 68 is used when the image stabilization unit is not attached, the LED of the display unit 116 indicating “1.6 ×” lights up. In addition, the aspect which displays the display content in the display apparatus 78 on the display part of a lens controller, the display part of a camera controller, etc. is also possible.
[0045]
Next, the operation of the lens device 14 configured as described above will be described. FIG. 8 is a flowchart showing an example of an operation when a double extender insertion is instructed by an extender switching switch or the like.
[0046]
When the extender switching signal is input to the control circuit 80 (step S810), the control circuit 80 determines whether or not the image stabilization unit 10 is attached (step S812). If the image stabilization unit 10 is not attached (NO determination), the process proceeds to step S814, and the control circuit 80 outputs a command signal for inserting the double extender. Based on this command signal, the extender switching drive unit 72 is operated, and the double conversion lens 64 insertion operation is executed (step S816). Next, the process proceeds to step S822, and the double extender insertion display LED (display unit indicated by reference numeral 115 in FIG. 7B) on the display device 78 is turned on.
[0047]
On the other hand, if it is determined in step S812 that the image stabilization unit 10 is attached (YES determination), the process proceeds to step S818. In step S818, the control circuit 80 outputs a command signal for inserting the 1.6 times extender. Based on this command signal, the extender switching drive unit 72 is activated, and the 1.6 times conversion lens 68 insertion operation is executed (step S820). Thus, the image magnification of 2 times is achieved by the combination of the 1.6 times extender and the enlargement magnification (1.25 times) of the image stabilizing unit 10.
[0048]
Next, the process proceeds to step S822, and the double extender insertion display LED (display unit indicated by reference numeral 115 in FIG. 7B) on the display device 78 is turned on. At this time, the LED of the display unit 110 indicating the mounting information of the image stabilization unit 10 and the LED of the display unit 112 indicating the operation information of the correction lens system are both turned on.
[0049]
As a result, the image formation size can be matched between when the anti-vibration unit is mounted and when it is not.
[0050]
In the above embodiment, an example in which a lens for magnification correction is incorporated in the turret 60 of the extender mechanism 36 has been described. However, an aspect in which an external correction optical system is detachable from the lens device is also possible.
[0051]
9 and 10 show an example of an external correction optical system. In the correction optical unit 120 shown in these drawings, a correction lens 124 is held by a lens frame 122, and a fastening screw 126 for connecting and fixing is provided on the peripheral surface of the lens frame 122. Further, a contact point 128 for determining unit mounting is provided at the end of the lens frame 122.
[0052]
A connecting portion 132 for attaching the correction optical unit 120 is formed at the front end portion (front lens side) of the lens device 130, and a contact 134 for unit mounting determination is provided at a position where it can contact the contact 128. ing.
[0053]
As shown in FIG. 10, the contact points 128 and 134 are aligned, the lens frame 122 of the correction optical unit 120 is fitted into the connecting portion 132, and the tightening screw 126 is screwed in, so that the correction optical unit 120 is in the lens apparatus. 130. A groove 136 is formed on the peripheral surface of the connecting portion 132, and the correction optical unit 120 is fixed to the lens device 130 when the tip of the tightening screw 126 presses the bottom surface of the groove 136.
[0054]
FIG. 11 is an enlarged view of the contact point 128 of the correction optical unit 120. As shown in the figure, the contact 128 has a structure in which the conducting member 140 is biased rightward in FIG. 11 by the spring 142 and the surroundings of the conducting member 140 and the spring 142 are covered by the non-conducting member 144. ing. With such a structure, the conducting member 140 can protrude and retract from the end surface of the lens frame 122, and when the correction optical unit 120 is mounted on the lens device 130, the conductive member 140 can reliably contact the contact 134 on the lens device 130 side. .
[0055]
FIG. 12 is a perspective view showing a main part of the structure of the contacts 128 and 134. Two contact points 134A and 134B are arranged apart from each other on the lens device side, and when the correction optical unit 120 is mounted, the contact point 128 of the correction optical unit 120 contacts the two contact points 134A and 134B at the same time. The connection between 134A and 134B is conducted, and the mounting signal is turned ON. Further, when the correction optical unit 120 is removed, the contacts 134A and 134B become non-conductive and the mounting signal is turned off. The mounting signal is sent to a control circuit in the lens device and used for a display for notifying whether or not the lens is mounted, and the correction optical unit 120 is used for controlling the moving amount of the movable lens of the image stabilization unit.
[0056]
FIG. 13 shows another example of the external correction optical unit. The correction optical unit 150 shown in the figure is connected to a bayonet mount 162 at the rear end of the lens device 160 using a fastening ring 170. A correction lens 154 is held on the lens frame 152 of the correction optical unit 150, and a screw portion 156 into which the fastening ring 170 is screwed is formed on the outer peripheral surface of the lens frame 152.
[0057]
A contact 158 similar to the contact 140 described in FIG. 11 is provided on the correction optical unit 150 side, and a contact 164 similar to the pair of contacts 134A and 134B described in FIG. 12 is provided on the bayonet mount 162. Yes. When the correction optical unit 150 is fixed to the bayonet mount 162 by the tightening ring 170, the pair of contacts 164 are conducted and the mounting signal is turned ON.
[0058]
14A is a front view of the bayonet mount 162, and FIG. 14B is a view seen from the direction of arrow A in FIG. FIG. 15 shows a connection structure between the lens device 160 to which the correction optical unit 150 described in FIG.
[0059]
The anti-vibration unit 180 is formed with a bayonet mount 162 protruding from the rear end of the lens device 160 and a recess (escape portion) 182 for accommodating the correction optical unit 150 connected thereto. When 180 is mounted, the correction optical unit 150 portion is accommodated in the recess 182 so that the rear end surface of the lens device 160 and the front surface of the image stabilization unit 180 are in close contact with each other.
[0060]
In FIG. 15, reference numeral 184 denotes a connecting hook provided on the lens device 160, and reference numeral 186 denotes a hook provided on the vibration isolator unit 10 side. By engaging the hooks 184 and 186 with each other, the lens The device 160 and the image stabilization unit 180 are connected.
[0061]
Reference numerals 192 and 194 are means for detecting whether or not the vibration isolator unit 10 is attached. For example, the reference numeral 192 is a contact similar to the contact 140 described with reference to FIG. 11, and the reference 194 is illustrated in FIG. The contacts are similar to the pair of contacts 134A and 134B described. Further, instead of such a contact structure, a connector for passing various information (electrical signals) between the lens device 160 and the image stabilizing unit 180 may be applied.
[0062]
Next, a mode in which the extender built-in correction lens described in FIGS. 1 to 8 is remotely controlled will be described.
[0063]
FIG. 16 shows a conceptual diagram of a television lens system that remotely controls the insertion operation of the correction lens incorporated in the extender mechanism 36, and FIG. 17 shows an example of a controller used in this system. As shown in these drawings, an extender changeover switch 200 and an auto / manual mode changeover switch 202 are provided on the zoom rate demand 26.
[0064]
By connecting the cable connector 212 of the zoom rate demand 26 to the connector 214 of the lens device 14, the control circuit 80 of the lens device 14 and the control circuit 218 of the zoom grade demand 26 are electrically connected. The extender switching switch 200 is provided on the signal line 221 for transmitting the extender switching signal, and the “ON” state of the switch corresponds to an extender switching signal of “double (2 ×)”, and the switch is in the “OFF” state. Corresponds to an “1 × (1 ×)” extender switching signal. This extender switching signal is input to the control circuit 80 as the “extender switching signal” in the flowchart described in FIG.
[0065]
The mode changeover switch 202 is provided on the signal line 223 for transmitting the image stabilization unit mounting signal, and the “ON” state of the switch is “MANU” and the “OFF” state of the switch is “AUTO”. It corresponds.
[0066]
As shown in FIG. 16, the lens device 14 has an anti-vibration unit attachment determination device 76, and when the anti-vibration unit 10 is connected, the attachment of the anti-vibration unit 10 is automatically determined by the attachment signal from the anti-vibration unit attachment determination device 76. If it has a configuration that can be used, the mode selector switch 202 is set to “AUTO”. In this case, the anti-vibration unit mounting signal is not output from the zoom rate demand 26 side, and the mounting / non-mounting of the anti-vibration unit 10 is automatically determined based on the mounting signal from the anti-vibration unit mounting determination device 76. Note that as a specific example of the image stabilization unit mounting determination device 76, the contact point 194 described with reference to FIG. 15 can be used. In this case, a device similar to the contact point 192 is provided on the image stabilization unit 10 side.
[0067]
The photographer sets the knob of the extender switching switch 200 shown in FIG. 17 to the “2 ×” or “1 ×” position according to the shooting situation, and switches the extender magnification. When the anti-vibration unit 10 is attached and the extender switching switch 200 is set to “2 ×”, the 1.6 × conversion lens 68 is inserted according to the flowchart described with reference to FIG. Is set to “1 ×”, the 0.8 times conversion lens 66 is automatically inserted.
[0068]
On the other hand, as shown in FIG. 18, when the lens device 14 does not include the image stabilization unit mounting determination device 76, that is, when it is not possible to automatically determine whether the image stabilization unit 10 is mounted or not, the mode change switch 202 is set to “MANU”. As a result, the image stabilization unit mounting signal is supplied from the control circuit 218 on the zoom rate demand side to the lens device 14 side, and the image stabilization unit mounting signal is forcibly input to the control circuit 80 of the lens device 14. In this state, when the extender changeover switch 200 is set to “2 ×”, a 1.6 × conversion lens 68 is inserted, and when the extender changeover switch 200 is set to “1 ×”, a 0.8 × conversion is performed. A lens 66 is inserted.
[0069]
Although not shown in the figure, a switch that can switch the magnification correction function automatically controlled by the extender mechanism 36 described above to ON (valid) / OFF (invalid) may be provided in a controller at hand such as the zoom rate demand 26. . Furthermore, a mode is also possible in which a selection switch that can arbitrarily select a conversion lens to be used among the conversion lenses 62, 64, 66, or 68 held on the turret 60 is provided in the zoom rate demand 26 or the like.
[0070]
In FIG. 16 to FIG. 18, the example in which the correction lens remote control switch is added to the zoom rate demand 26 has been described. However, the focus demand 25 may be provided with a remote control switch without being limited to the zoom rate demand 26. It is also possible to incorporate a remote control switch into the camera operation panel or pan head controller.
[0071]
In the above embodiment, a box-type television lens device (EFP lens device) has been described as an example, but the present invention can also be applied to other lens devices such as an ENG lens.
[0072]
【The invention's effect】
As described above, according to the television lens device of the present invention, since the correction lens system having a magnification conversion function that cancels the magnification by the image stabilization unit is added on the photographing optical axis, An image forming size equivalent to that when the unit is not mounted can be obtained even when the unit is mounted. As a result, the original optical performance of the lens device can be ensured, and the lens operation equivalent to that when the image stabilization unit is not mounted can be performed even when the image stabilization unit is mounted.
[Brief description of the drawings]
FIG. 1 is a perspective view of a television camera apparatus to which the present invention is applied.
FIG. 2 is a side view of a television camera apparatus to which the present invention is applied.
FIG. 3 is a configuration diagram of an optical system of the television camera apparatus of this example.
4 is a front view of the turret in the extender mechanism shown in FIG.
FIG. 5 is a chart showing the correspondence between the extender magnification and the magnification of the correction lens system.
FIG. 6 is a block diagram showing the main configuration of the lens device and the image stabilization unit according to the present embodiment.
FIG. 7 is a diagram showing a display example in a display device provided in the lens device.
FIG. 8 is a flowchart showing an operation example of the lens apparatus of the present example.
FIG. 9 is a cross-sectional view showing an example of an external correction optical system
10 is a cross-sectional view showing a state in which the correction optical unit shown in FIG. 9 is connected to a lens device.
11 is an enlarged view of a contact provided in the correction optical unit shown in FIG.
FIG. 12 is a perspective view of a main part showing the structure of a contact for detecting whether the correction optical unit is attached or not.
FIG. 13 is a cross-sectional view showing another example of an external correction optical unit.
14A is a front view of the bayonet mount of the lens device shown in FIG. 13, and FIG. 14B is a view as seen from the direction of arrow A in FIG.
15 is a cross-sectional view of an essential part showing a coupling structure between a lens apparatus to which the correction optical unit shown in FIG. 13 is connected and an image stabilization unit.
FIG. 16 is a conceptual diagram of a television lens system that remotely controls the insertion operation of a correction lens incorporated in the extender mechanism.
FIG. 17 is a diagram showing an example of a controller used in the television lens system shown in FIG.
FIG. 18 is a conceptual diagram of a television lens system that remotely controls the insertion operation of a correction lens incorporated in an extender mechanism.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Anti-vibration unit, 12 ... Television camera apparatus, 14 ... Lens apparatus, 16 ... Camera body, 26 ... Zoom rate demand, 36 ... Extender mechanism, 60 ... Turret, 62, 64, 66, 68 ... Conversion lens, 42 ... Movable lens, 46 ... anti-vibration lens group, 76 ... anti-vibration unit mounting discriminating device, 78 ... display device, 80 ... control circuit, 120 ... correction optical unit, 124 ... correction lens, 200 ... extender switching switch, 202 ... mode Changeover switch

Claims (8)

In a television lens apparatus in which a vibration proof unit having a vibration proof lens for correcting image blur caused by vibration applied to the camera is detachably mounted,
The television lens device includes a correction lens system having a magnification conversion function that cancels an enlargement magnification caused by an action of a lens group incorporated in the image stabilization unit.
When the image stabilization unit having the magnification is mounted, the correction lens system is disposed on the photographing optical axis, and the magnification of the image stabilization unit is offset by the combination of the image stabilization unit and the correction lens system. it, the television lens apparatus the image stabilization unit, wherein Rukoto give imaging size when equivalent to not mounted to.   2. The television lens according to claim 1, wherein the television lens device includes an extender optical system that converts an imaging magnification, and the correction lens system is incorporated in an extender switching device that switches the extender optical system. apparatus.   The television lens apparatus according to claim 2, wherein the extender switching device includes a plurality of correction lens systems having different magnifications corresponding to each extender magnification. The television lens device includes a wearing discriminating means for detecting whether or not a vibration isolating unit is attached,
Control means for operating the extender switching device so that the corresponding correction lens system is automatically inserted on the photographing optical axis when the attachment determination means detects the attachment of the image stabilization unit. The television lens device according to claim 2 or 3, wherein   4. The television lens according to claim 2, further comprising selection means for giving an instruction to select a state in which the correction lens system is inserted on the photographing optical axis and a state in which the correction lens system is retracted from the photographing optical path. apparatus. 2. The television according to claim 1, wherein the correction lens system is configured as an external unit that can be attached to and detached from a front end portion on the front lens side or a rear end portion on the rear lens side of the TV lens device. Lens device.   7. The television lens apparatus according to claim 1, further comprising display means for indicating that the correction lens system is inserted on a photographing optical axis.   Remote control operation means for generating at least one of a command signal for inserting the correction lens system on the photographing optical axis and a command signal for retracting the correction lens system from the photographing optical axis. The television lens device according to claim 2, wherein the television lens device is a television lens device.

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