JP2002182102A - Lens system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens system capable of realizing the initialization of an extender suitable for an operator in the case of switching the magnification of the extender according to command signals given from several systems by a postoperation priority system. SOLUTION: The command signal for commanding the magnification of the extender is inputted in an extender control part 10 from a camera 14 and a lens accessory 16. The CPU 18 of the control part 10 makes the command signal inputted from the system operated later effective and sets the extender (turret 12) to magnification commanded by the command signal made effective, then the magnification of the extender is stored in a memory 28 every time it is switched. When a power source is turned on after it is turned off, the CPU 18 reads out the magnification stored in the memory 28 and initializingly sets the extender to the read magnification.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens system, and more particularly to a lens system having an extender for switching a focal length of a taking lens to a predetermined magnification.

[0002]

2. Description of the Related Art Conventionally, in a lens system used in a television camera, for example, a 1x and 2x variable magnification lens (extender lens) is arranged on a disk-shaped turret, and the turret is rotated to take a photographing light. There is known an extender in which these lenses are inserted and removed on a road so that a photographing magnification (focal length) can be instantaneously switched between 1 × and 2 ×. In the case of electrically changing the magnification of the extender, for example, the switching is performed based on a command signal from a lens accessory or a camera.

[0003]

When the magnification of the extender is switched by a command signal from a plurality of systems such as a lens accessory (lens accessory) and a camera as described above, the command signal from any system is effective. It is conceivable to adopt a post-operation priority method generally known as a control method based on command signals from a plurality of systems. The post-operation priority method is to make the command signal from the last operated system valid, for example,
After the extender is multiplied by 1 according to the command signal from the camera and the command signal from the lens accessory is switched from 1x to 2x, the command signal from the lens accessory is enabled and the extender is increased from 1x to 2x. Switch. As described above, in the post-operation priority mode, the magnification of the extender can be switched using the desired system regardless of which system has been used before to switch the extender magnification. It is.

However, when a post-operation priority system is used for controlling the extender based on command signals from a plurality of systems, there is a problem in what magnification the extender is initially set when the power is turned on. In other words, the turret may rotate while the power is off, and the extender setting may not be appropriate. Therefore, when the power is turned on, the extender must always be initialized to one of the magnifications. However, even if the magnification is initially set to a magnification determined in advance by the manufacturer, the initial setting desired by the operator is not always set. If the manufacturer provides one mode of initial setting, it is considered that it is preferable for the operator to initially set the power-off magnification in the previous use, but in this case, each system at power-on is preferably used. There is a problem that such initial settings cannot be made because the magnification at power-off is not known from the command signal given by the user.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and enables the extender to be initially set to the magnification at the time of power-off at the time of previous use when the power is turned on, or to select such an initial setting. It is an object of the present invention to provide a lens system that enables an operator to select an extender that is suitable for the operator by enabling the operator to select an initial setting in another mode.

[0006]

In order to achieve the above object, according to the first aspect of the present invention, a command signal is provided from a plurality of systems for magnification switching of an extender for switching a focal length of a photographing lens to a predetermined magnification. Along with switching the extender magnification to a predetermined magnification,
When the magnification commanded by giving priority to a post-operated command signal of the plurality of systems is switched, in the lens system that switches the magnification of the extender to the magnification commanded by the command signal, Storage means for storing setting information relating to the setting magnification of the extender; and setting information obtained from the storage means when the power is turned on, and the setting magnification of the extender when the power is turned on is set based on the setting information. And extender setting means for initial setting.

[0007] The invention described in claim 2 is the first invention.
In the invention described in (1), the storage means stores, as setting information, a set magnification of the extender when the power is turned off.

[0008] The invention described in claim 3 is the first invention.
In the invention described in the above, in the mode of initially setting the set magnification of the extender at the time of power-on to a predetermined magnification, or the mode of initially setting to the magnification commanded by a command signal initially given from a specific system It is characterized by being switchable.

The invention described in claim 4 is the first invention.
In the invention described in (1), the system is a camera or a lens accessory connected to the photographing lens.

According to the present invention, since the setting information relating to the set magnification of the extender when the power is turned off (information on the set magnification itself) is stored, the magnification of the extender is set based on the setting information when the power is turned on. The initial setting can be made to the set magnification when the power is turned off. In addition, such an initial setting can be made selectable, and other types of initial settings can be made selectable. This enables the initial setting of the extender suitable for the operator.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a lens system according to the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram showing a configuration of an extender control unit in a lens system according to the present invention. The extender control unit 10 shown in FIG. 1 is mounted on a photographic lens (lens device) mounted on, for example, a television camera, and drives a turret 12 disposed in the photographic optical system to rotate the turret 12, thereby obtaining a photographic magnification ( (Focal length) is converted, for example, from 1 to 2 times, or from 2 to 1 times. The magnification of the extender is not limited to 1 × and 2 ×, and the magnification is not limited to 2 types. In the present embodiment, the shooting magnification (extender magnification) converted by the extender is 1 × and 2 ×. It is assumed that the turret 12 is provided with a lens for increasing the magnification by 1 and a lens for increasing the magnification by 2.

The extender control unit 10 includes a camera 1
4 and lens accessories 16 (lens accessories such as a controller), a plurality of command signals (hereinafter, referred to as extender positions) for commanding the extender magnification (hereinafter referred to as extender position).
Extender signal).
These extender signals are input to the CPU 18 of the extender control unit 10. The camera 14 and the lens accessory 16 are provided with an operation unit (switch, etc.) for an operator to specify an extender position. Further, in the present embodiment, the two systems for inputting the extender signal to the extender control unit 10 are the camera 14 and one lens accessory 16, but the present invention is not limited to two systems and any number of systems are provided. The present invention can also be applied to a case in which an extender signal can be input from.

The CPU 18 validates the extender signal from the post-operated system among the extender signals supplied from the two systems of the camera 14 and the lens accessory 16 based on the post-operation priority system processing as described later. I do. A drive signal for driving the motor 24 in a predetermined direction and at a predetermined speed while detecting the position of the turret 12, that is, the extender position, with the position sensor 20 so that the valid extender signal becomes the commanded extender position. To the drive circuit 22. The drive circuit 22 controls the rotation speed of the motor 24
The motor 24 is driven on the basis of the drive signal given from the CPU 18 while detecting by the step 6 to rotate the turret 12. Thus, the extender is set at the extender position specified by the valid extender signal.

Regarding the initial setting of the extender when the power is turned on, the CPU 18 stores the extender position when the power is turned off in the memory 28 in advance, and reads out the extender position when the power is turned off from the memory 28 when the power is turned on. The extender is initially set to that position. Thus, when the power is turned off and then turned on next time, the extender is automatically initialized to the magnification used in the previous use, and the operator switches the extender position every time the power is turned on. Time can be saved.

The CPU 18 performs not only the process of the extender but also the process of zoom and focus for driving the zoom lens and the focus lens mounted on the photographing lens based on a signal given from a lens accessory or the like. In such a case, zoom and focus processing are performed together with the extender processing. However, in the present embodiment, description other than the process of the extender is omitted.

Next, the processing procedure of the extender in the CPU 18 will be described with reference to the flowcharts of FIGS. As shown in the main routine of FIG. 2, when the power is turned on, the CPU 18
Is read out (step S10). The EXT position stored in the memory 28 is the EXT position when the power is turned off as described later.
This is the T position. Next, the processing of zoom, focus, and extender (steps S12 to S16) is repeatedly executed. The processing of zoom and focus is omitted, and the processing of the extender will be described below.

As shown in the subroutine of FIG. 3, in the processing of the extender, the CPU 18 first
4 and an extender signal (hereinafter referred to as a camera signal) provided from the lens accessory 16 (hereinafter referred to as a lens signal) (Step S2).
2). Next, it is determined whether or not the power is turned on, that is, whether or not the processing of this subroutine is the first processing after the power is turned on (step S24). If the determination is Yes, the data read from the memory 28 (ie, the EXT position when the power is turned off) in step S10 of FIG.
Replace with control signal. The EXT control signal is a signal for instructing the extender position where the extender (turret 12) is actually set in the process of step S48 described later. on the other hand,
If the determination in step S24 is No, that is, if the processing of this subroutine is the second or subsequent time after the power is turned on, the processing of step S26 is not performed.

Next, the CPU 18 determines whether or not the camera signal has changed (step S28). Whether or not the camera signal has changed is determined in step S20 when the processing of this subroutine is performed for the second time after the power is turned on.
The determination is made based on whether the camera signal read in step 2 has changed from the previous camera signal. If this subroutine is the first time after the power is turned on, step S
The determination at 28 is No. If the determination in step S28 is Yes, that is, if there is a change in the camera signal, the CPU 18 replaces the camera signal with the EXT control signal as a result of the post-operation (step S30). Then, the state is set to the storage permission (step S32). On the other hand, if No is determined in step S28, the processes in steps S30 and S32 are not executed, and the storage is prohibited.

Next, the CPU 18 proceeds to step S28.
It is determined whether or not the lens signal has changed in the same manner as in Step S32 (Step S34). Whether or not the lens signal has changed is determined by whether or not the lens signal read in step S22 has changed from the previous lens signal in the second and subsequent times after the power is turned on in the processing of this subroutine. . If this subroutine is the first time after the power is turned on, step S3 is always performed.
4 is determined as No. If in this step S34 Y
If it is determined as es, that is, if there is a change in the lens signal, the CPU 18 replaces the lens signal with the EXT control signal as a result of the post-operation (step S3).
6). Then, the state of the storage permission is set (step S3).
8). On the other hand, if No is determined in step S34, the processes in steps S36 and S38 are not executed, and the storage is prohibited.

Subsequently, the CPU 18 proceeds to step S3.
2 or a determination is made as to whether the storage is permitted in step S38 (step S40). Yes
Then, it is determined whether or not the EXT control signal and the current extender position read from the position sensor 20 match (step S42). Here, when it is determined as No, that is, EXT
After the control signal is replaced with the camera signal or the lens signal in step S30 or step S36, the step S4 is performed until the extender position is set to the position of the EXT control signal.
Step S4 without performing the processing of Step S4 and Step S46.
Then, the process proceeds to a step S8. On the other hand, if Yes is determined in step S42, the current extender position is stored in the memory 28 (step S44), and the storage is prohibited (step S46).

Next, the CPU 18 proceeds to step S2.
6. In step S30 or step S36, E
When the XT control signal is replaced, the EX
The extender (turret 12) is set by normal extender processing so as to be at the extender position indicated by the T control signal (step S48).

When the processing of the above subroutine is completed,
Returning to the main routine in FIG. 2, steps S12 to S12 in FIG.
While repeating the processing of step S16, step S1
The process of FIG. 3 is repeated by the process of the extender of No. 6.

According to the processing procedure of the extender in the CPU 18, when the power is turned off by the process of step S44 in FIG. 3, the extender position at the time of power off is stored in the memory 28. After that, when the power is turned on, the extender position when the power is turned off is read from the memory 28 by the processing of step S10, and the extender is initialized to the extender position by the processing of steps S26 and S48. After the initial setting is completed, when an extender position is switched in any of the camera 14 and the lens accessory 16 to change the extender signal, the extender signal is changed by the processing in steps S28 to S38 and step S48. The extender position is switched to the position specified by. That is, the extender position is switched by the post-operation method.

As described above, in the above embodiment, step S4
In 4, the present extender position is stored in the memory 28, but an EXT control signal may be stored. Also, instead of storing the extender position when the power is turned off in the memory 28, a plurality of systems (the camera 14 or the lens accessory 1 in the above embodiment) are used.
6) The system in which the last extender position switching operation was performed is stored in the memory 28, and when the power is turned on, the system is read from the memory 28, and the extender position specified by the extender signal initially given from the system is supplied. The extender may be initialized.

In the above-described embodiment, the extender is initially set at the power-off extender position when the power is turned on. However, the initial setting in another mode can be performed by the operator's selection. Good. For example, as an aspect of the initial setting other than the above-mentioned initial setting, an extender position (a specific extender commanded by an extender signal given from a specific system (the camera 14 or the lens accessory 16 in the above embodiment) when the power is turned on). A mode in which an extender is initially set to an extender position set by an extender position setting unit in a system, or an extender is initially set to a predetermined specific extender position (one or two times in the above embodiment). Embodiments are conceivable. Among these initial setting modes including the initial setting mode described in the above embodiment, all modes or any of a plurality of modes can be selected by a predetermined switch.

The processing procedure when any one of a plurality of initial setting modes can be selected as described above is as follows.
2 and 3 are changed as follows. When the power is turned on, the CPU 18 first reads which initial setting mode is selected from a selection means such as a switch provided on a photographic lens or the like. Next, in step S10 of the flowchart of FIG.
The data (extender position) corresponding to the selected initial setting mode is read. For example, when initially setting the extender position when the power is turned off as in the above embodiment, the extender position stored in the memory 28 is read as described above, and the extender position specified by the extender signal from the camera 14 is set to the extender position. In the case of initial setting, the extender signal is read.
In the case of initial setting to a predetermined specific extender position, the specific extender position is read.
Then, in step S26 of the flowchart in FIG. 3, the extender position read in step S10 is replaced with an EXT control signal.

Further, in the above-described embodiment, the extender position set at that time when the power is turned off is stored in the memory 28. However, the storage timing is not limited to this, and when the extender position is changed. Alternatively, it may be performed at regular intervals (for example, once a minute).

[0029]

As described above, according to the lens system of the present invention, setting information relating to the set magnification of the extender when the power is turned off (information of the set magnification itself).
Is stored, so that when the power is turned on, the extender magnification can be initialized to the set magnification when the power is turned off based on the setting information. In addition, such an initial setting can be made selectable, and other forms of initial setting can be made selectable. This enables the initial setting of the extender suitable for the operator.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an extender control unit in a lens system according to the present invention.

FIG. 2 is a flowchart illustrating a main routine of a process in a CPU in FIG. 1;

FIG. 3 is a flowchart showing a subroutine relating to an extender process in the CPU of FIG. 1;

[Explanation of symbols]

10 ... Extender control unit, 12 ... Turret, 14
... Camera, 16 ... Lens accessories, 18 ... CPU, 28 ...
memory

Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat II (Reference) H04N 5/232 H04N 5/232 A EF term (Reference) 2H044 DA03 DB02 DC01 DE01 DE06 HC05 2H101 DD01 DD02 DD03 DD05 DD09 DD42 DD43 DD52 DD53 DD65 EE04 EE05 EE09 EE13 EE21 EE51 EE98 2H105 EE00 EE05 EE31 EE33 5C022 AB21 AB66 AC54 AC69 AC74

Claims (4)

[Claims] 1. A command signal is provided from a plurality of systems for switching the magnification of an extender for switching a focal length of a photographing lens to a predetermined magnification, and after switching the magnification of the extender to a predetermined magnification, the plurality of the When the magnification commanded by prioritizing the command signal operated after is switched, in the lens system that switches the magnification of the extender to the magnification commanded by the command signal, a setting related to the set magnification of the extender when the power is turned off is provided. A storage unit for storing information; an extender setting for obtaining setting information from the storage unit when the power is turned on, and for initially setting a set magnification of the extender when the power is turned on to a setting magnification when the power is turned off based on the setting information. Means, and Lens system. 2. The lens system according to claim 1, wherein the storage unit stores, as setting information, a set magnification of the extender when the power is turned off. 3. A mode in which the set magnification of the extender when the power is turned on is initially set to a predetermined magnification or a mode in which the set magnification is initially set to a magnification commanded by a command signal initially given from a specific system. The lens system according to claim 1, wherein the lens system is enabled. 4. The lens system according to claim 1, wherein the system is a camera or a lens accessory connected to the photographing lens.