JP2963231B2 - Zoom lens device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a zoom lens device, and more particularly to a zoom lens device for electrically controlling a zoom magnification.

[0002]

2. Description of the Related Art Heretofore, a zoom lens apparatus for limiting a zoom magnification has been able to limit the magnification only at a certain fixed magnification and only on the telephoto side.

[0003]

However, in the above-described conventional example, there is a problem that the magnification to be limited cannot be freely determined because the restriction can be made only by a fixed magnification on the telephoto side.

[0004] Further, since the restriction on the wide side cannot be made, when a wide conversion lens is mounted, development (commonly called "vignetting") in which a shadow of a lens frame portion appears around the screen on the wide side is prevented. There was a problem that can not be.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a user can arbitrarily register a limiting magnification and control the position of a zoom lens using the registered magnification. It is an object of the present invention to set a magnification to be restricted and to set a restriction magnification on a wide side, thereby preventing "vignetting" on a screen when a wide conversion lens is attached.

[0006]

In order to achieve the above object,
Therefore, in the present invention, the zoom lens device is described in the following (1).
Be configured. (1) Zooming means for moving a zoom lens, zooming operation means for operating the zooming means, control means for electrically limiting a variable magnification of the zooming means by the zooming operation means, and limitation by the control means. Set the variable range of the zooming means
Setting means for arbitrarily setting the ratio by said's
The variable magnification range of the zooming means and the setting means
The set magnification and the current magnification of the zoom lens
On the same display unit at the same time.
For example was the zoom lens device.

[0007]

[0008]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of a zoom lens device according to an embodiment of the present invention, FIG. 2 is a diagram illustrating registration of a magnification limit value of the embodiment, and FIG. 3 is a diagram illustrating registration data display of the embodiment. 4 is a flowchart for controlling the operation of this embodiment.

In FIG. 1, reference numeral A denotes a zooming means, which comprises a zooming motor 2 and means for moving the zoom lens 1. B is a zooming operation means, which is constituted by a zoom button 7 composed of a wide (W) and a tele (T) button, and is a means for operating the zooming means A. C is a position detecting means, which is constituted by a position detecting section (hereinafter referred to as an encoder) 3 and is a means for detecting the position of the zoom lens 1.

Reference numeral D denotes a control means which is constituted by the control unit 5 and which can electrically limit the variable magnification by operating the zooming operation means B. E denotes a registration unit, which is constituted by the registration unit 8, and is a unit capable of arbitrarily registering the limiting magnification. F is a display unit, which is constituted by the display unit 4 and is a unit capable of displaying the registered magnification. G is a storage unit, which is configured by the storage unit 6 and is a unit that can store the registered magnification. Details of each of the above means will be described later.

The display section 4 is for displaying to the user the magnification to which the restriction is applied.
A CD or the like is conceivable. The control unit 5 integrally controls the entire system. The storage unit 6 electrically stores the magnification registered by the registration unit 8 and the position information from the encoder. The registration unit 8 is for registering a magnification to be restricted by the user, and includes a pair of electrical switches for registering the minimum wide and tele and a clear switch for canceling the registration.

Next, the operation of this embodiment will be described with reference to FIG. In FIG. 2, the switch 12 on the tele side of the registration unit 8
Is pressed, the control unit 10 reads the numerical value 13 of the position information from the encoder 9 in the storage unit 6 and stores the numerical value in the storage unit 6 as telephoto magnification data (teleside limit magnification).
15 is stored. Similarly, when the wide-side switch 11 of the registration unit 8 is pressed, the control unit 10 stores the zoom lens position information (position information value) 13 from the encoder 9 in the storage unit 6 at the wide-side limit magnification (wide-side limit magnification). Magnification data) 1
4 is stored.

FIG. 2 shows a detailed diagram relating to this registration. 2, the control unit 10 is the same as the control unit 5 in FIG. 1, and the encoder 9 is the same as the position detection unit 3 in FIG. The control section 10 controls the tele side and wide side limit magnification data 1
4 and 15 are stored in the storage unit 6 and at the same time, L
The information is displayed on a display unit 4 such as a CD or EVF in a form that is easy for the user of the zoom lens to understand. FIG. 3 shows an example of this display method.

FIG. 3 shows an example in which an EVF of a video camera is used as a display unit.
Reference numeral 6 denotes a mark indicating the position of the limit magnification on the wide side, and reference numeral 27 denotes a mark indicating the position of the limit magnification on the telephoto side. Further, the control unit 10 always reads the position information from the encoder 9 at a fixed time interval, writes the position information as the zoom lens position information 13 in the storage unit, and attaches a lens position mark 28 on the bar 25 of the display unit.

When the clear switch 16 is depressed, the control unit 10 stores the minimum magnification data of the zoom lens in the wide-side limiting magnification data 14 and the telephoto-side limiting magnification data 15 regardless of the zoom lens position information 13. The maximum magnification data of this zoom lens is written.

According to this registration method, the user of the zoom lens to which this embodiment is applied zooms to the position of the desired zoom magnification on the tele side, presses the tele side registration switch 12, and sets the desired position on the wide side. Zooming is performed to the position of the zoom magnification to be performed, and the wide-side registration switch 11 is pressed to register the limit magnification of the zoom lens. To cancel the registration, the clear switch 16 is pressed.

Next, a control means for restricting the zoom magnification based on the restriction magnification data registered according to the above-described registration means will be described with reference to FIG. FIG. 4 shows a flowchart of control of the zoom lens when the zoom button 7 (FIG. 1) is pressed. In FIG.
P represents the current position of the zoom lens, W1 represents the wide-side limit value of the zoom lens, and T1 represents the tele-side limit value of the zoom lens, and correspond to 13, 14, and 15 in FIG. First, if the zoom button on the wide side is depressed according to the determination in step 18 of FIG. 4, a comparison of P> W1 is performed (step 19), and if P> W1 (still up to the wide-side magnification limit value). If not, the zooming motor 2 (FIG. 1) is rotated to the wide side (step 21), and if P ≦ W1 (when it reaches the wide-side magnification limit value), the zooming motor 2 is stopped ( Step 2
0).

If it is determined in step 18 that the zoom button on the telephoto side has been pressed, P <T1
(Step 22), and if P <T1 (if the telephoto magnification limit value has not yet been reached), the zooming motor 2 is rotated to the telephoto side (Step 23).
When P ≧ T1 (when the telephoto magnification limit is reached)
Then, the zooming motor 2 is stopped (step 24). If the control unit 5 performs control in accordance with this flowchart at regular intervals, the variable minimum magnification and the variable maximum magnification can be restricted by the zoom magnification restriction value registered by the user. By using the above-described method, the user can arbitrarily set the limit magnification on the wide side and the tele side, and limit the zoom magnification based on the magnification.

[0019]

As described above, according to the present invention, by registering the limit magnification and controlling the position of the zoom lens using the registered magnification, the user can set the magnification to be arbitrarily restricted. In addition, since the limit magnification on the wide side can be set, "vignetting" on the screen when the wide conversion lens is attached can be prevented.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a zoom lens device according to an embodiment of the present invention.

FIG. 2 is a diagram showing registration of a magnification limit value according to the embodiment;

FIG. 3 is a diagram showing a display of registration data of the embodiment.

FIG. 4 is a flowchart for controlling the operation of this embodiment.

[Explanation of symbols]

 A zooming means B zooming operation means C position detection means D control means E registration means F display means G storage means Y zoom lens device 1 zoom lens 2 zooming motor 3 position detection section 4 display section 5 control section 6 storage section 7 zoom button 8 Registration unit In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

(57) [Claims] A zooming unit that moves a zoom lens; a zooming operation unit that operates the zooming unit; a control unit that electrically limits a variable magnification of the zooming unit by the zooming operation unit; Possible to limit the zooming means
Setting means for arbitrarily setting the ratio by setting the variable range, and the magnification variable range of said zooming means, said setting means
Thus, the set magnification and the current magnification of the zoom lens
A rate, a zoom lens apparatus characterized by comprising a display means capable of displaying simultaneously on the same display unit.