JP2748423B2 - Shooting device with variable filter effect - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photographing apparatus with a variable filter effect, and in particular, by eccentrically driving a part of a correction optical system in a photographing system according to an external input signal. The present invention relates to a variable filter effect photographing apparatus that applies an arbitrary filter effect such as a soft effect or a cross effect to an image formed by a photographing system.

2. Description of the Related Art Conventionally, a soft filter, a cross filter, or the like is detachably attached to a part of a photographing system, for example, to attach various filters to an image formed by the photographing system and photograph the image. Have been. For example, in port rail photography, a soft filter is often used.

In general, in order to impart a desired filter effect to an image formed by a photographing system, it is necessary to attach filters each having a predetermined optical characteristic in front of the photographing system or in the photographing system each time. As a method for mounting the filter, for example, there is a method in which the filter is mounted and fixed to a front end portion of a lens barrel in front of an imaging system by a screw method or the like.

The fixing operation at this time is extremely troublesome.For example, when replacing the filter, it is necessary to hold the filter to be replaced with the right hand, fix the camera with the left hand, and screw down the used filter with the right finger to remove it. It was very inconvenient.

For this reason, there is a problem that even if there is a photo opportunity that desires the filter effect, the filter cannot be mounted instantly on the spot and the photo opportunity is missed.

(Problems to be Solved by the Invention) The present invention is based on the fact that a part of the correction optical system of the photographing system is driven eccentrically at a predetermined amplitude frequency during exposure of a photosensitive surface without using a conventional optical filter. It is another object of the present invention to provide a photographing apparatus capable of easily and quickly applying various filter effects to an image formed by a photographing system.

In particular, when the photographing system has a so-called anti-vibration means configured to correct image blur due to camera vibration or the like, the apparatus is used by using an optical system driven by the anti-vibration means as a correction optical system. It is an object of the present invention to provide a photographing apparatus with a variable filter effect which can easily obtain a predetermined filter effect while preventing the overall complexity.

(Means for Solving the Problem) A part of the correction optical system of the photographing system is eccentrically driven during exposure of the photosensitive surface based on the amplitude frequency signal inputted from the outside by the driving means, and formed by the photographing system. That is, a desired filter effect is imparted to the image to be formed.

In particular, the present invention is characterized in that the correction optical system is eccentrically driven at the same time as the exposure of the photosensitive surface or after a certain delay time from the exposure to obtain a desired filter effect.

(Embodiment) FIG. 1 is a schematic view of a main part of a first embodiment in which the image pickup apparatus having a variable filter effect according to the present invention is applied to a photographing system having an image stabilizing unit.

In the figure, 52 is a camera body, 511 is an optical axis of a photographic system (not shown), and 58 is a correction optical system of a part of the photographic system. 58a, 58
b denotes a driving unit as a driving unit, and the correction optical system 58
Are driven eccentrically in the x-axis direction 510b and the y-axis direction 510a.
Reference numerals 53a1 and 53b1 denote angular accelerometers, which detect a vertical blur direction 54a and a horizontal blur direction 54b of the camera body 52. 53a2,53b
Reference numeral 2 denotes angular acceleration detection directions detected by the angular accelerometers 53a1 and 53b1, respectively.

In FIG. 2, reference numerals 57a and 57b denote analog integration circuits, respectively, for example, by integrating the angular acceleration signals from the angular accelerometers 53a1 and 53b1 for the first order to determine the camera shake speed of the camera body 52, or by integrating the angular acceleration signals twice. The camera shake displacement amount of the camera body 52 is obtained.

The output signals from the analog integration circuits 57a and 57b are
8a and 58b.

Reference numerals 11a and 11b denote sinusoidal amplitude frequency signals for giving a predetermined filter effect to an image obtained by the photographing system input from the outside, and are input to the drive units 58a and 58b, respectively.

Next, the optical action of the image stabilizing optical system in this embodiment will be described.

For example, camera shake is usually 1Hz to 12H in frequency
It corresponds to the vibration of z. In order to obtain an image free from image blur when such camera shake occurs at the time of the release of the camera shutter, it is necessary to detect camera vibration due to camera shake and drive the correction lens eccentrically according to the detected value.

Therefore, in the present embodiment, the camera shake or vibration of the camera body 52 is detected by the angular accelerometers 53a1 and 53b1, and the angular accelerometers 53a1 and 53b1 are detected.
The detection signal is input from b1 to the analog integration circuits 57a and 57b. The output signals from the analog integration circuits 57a and 57b are input to the driving units 58a and 58b.

The drive units 58a and 58b connect the correction optical system 58 to the analog integration map path 57.
The optical axis 511 is moved in the vertical direction of the x-axis direction 510a and the y-axis direction 510b based on the output signal from the
An eccentric drive such as tilting or rotating tilt is performed with respect to 511. Thus, the image blur is corrected.

Next, an optical operation in the case where a predetermined filter effect is applied to an image formed by the imaging system in this embodiment will be described.

The drive units 58a and 58b drive the correction optical system 58 based on the amplitude frequency signals 11a and 11b input from external input means, for example, for a predetermined time during the exposure of the photosensitive surface 59 to the optical axis eccentricity. The amplitude frequency signals 11a and 11b at this time are generally much smaller than the optical axis eccentric drive amplitude by the correction optical system 58 when correcting image blur due to camera shake of the camera body 52.
The amplitude frequency signals 11a and 11b are shifted in phase by 90 degrees, are extremely small compared to the previous image blur amount, and apply a substantially circular blur to the image formed by the photographing system on the photosensitive surface 59. ing. In this embodiment, for example, a soft effect is provided.

In the present embodiment, the eccentric drive of the correction optical system is driven in a state in which the eccentric drive amount for image blur correction and the eccentric drive amount for providing the filter effect are added, as described later.

FIG. 2 is a block diagram of the first embodiment showing a signal input form when the correction optical system 58 is driven by the drive units 58a and 58b in order to obtain a vibration proof effect and a filter effect in the present invention.

In the figure, signals related to the amount of shake obtained by the angular accelerometers 53a1 and 53b1 are input to the adders 15a and 15b via analog integration diagram paths 57a and 57b. On the other hand, filter blocks 14a and 14b for outputting a signal for obtaining a filter effect described later.
Are input to the adders 15a and 15b, and are added to the signal related to the amount of blur, and the signal at that time is output to the driving units 58a and 58b.
Entered in b. The drive units 58a and 58b drive the correction optical system 58 based on signals from the adders 15a and 15b, thereby obtaining a vibration proof effect and a desired filter effect.

FIG. 3 is a block diagram of one embodiment of the filter blocks 14a and 14b shown in FIG.

In the figure, reference numerals 16a and 16b denote signal sources, which output variable signals applied from external input means for imparting various filter effects. Here, the signals from the signal sources 16a and 16b are sinusoidal amplitude frequency signals whose phases are shifted by 90 degrees as described above. The signal sources 16a and 16b are for exposing the photosensitive surface,
When the release switches 18a and 18b are turned on, the analog switches 17a and 17b input the data to the drive unit via an adding circuit (not shown).

In FIG. 3, a signal source 19 is used instead of the signal sources 16a and 16b.
Using a and 19b, as shown in the figure, the waveform of the amplitude frequency signal is first set to 0 output for a fixed time, and after a predetermined time elapses,
It may be configured to output an amplitude frequency signal. According to this, an image having an extremely good soft effect in which the center of the obtained subject image is clear can be obtained.

FIGS. 4 and 5 are block diagrams of second and third embodiments, respectively, showing a signal input form in a variable filter effect imaging apparatus according to the present invention.

In the second embodiment shown in FIG. 4, the release switches 18a, 18
The signal from b is input to the analog switches 17a and 17b after passing through the delay circuits 22a and 22b.

That is, the signal wavelengths 16a and 16b having a predetermined amplitude frequency are input to the drive units 58a and 58b of the correction optical system after a lapse of a predetermined time after the release (photosensitive surface exposure starts). And the signal 1
The correction optical system is eccentrically driven by the drive unit using 6a and 16b. Thereby, the same filtering effect as in the case of the amplitude frequency waveforms 19a and 19b in FIG. 3 is obtained.

In the present embodiment, the shutter speed 21 is added to the delay circuits 22a and 22b.
Is also input. Thus, for example, the delay time is set to be shorter as the shutter speed is increased, so that a constant tone filter effect is always obtained at any exposure time.

In the third embodiment shown in FIG. 5, the release switches 18a, 18
First, the release signal from b is delayed through delay circuits 22a and 22b as in the embodiment of FIG.
The signals are input to the driving units 58a and 58b via 7a and 17b, and the driving units drive the correction optical system eccentrically. On the other hand, after delaying the release signal via the delay circuits 22a and 22b, the aperture driving unit 31
Is being entered. After the exposure on the photosensitive surface, after a lapse of a certain time, the aperture opening diameter is reduced or gradually changed. As a result, an image having a well-tuned filter effect is obtained in which the core is displaced and the amount of exposure becomes extremely small as it goes to the periphery of the image.

In each of the above embodiments, a correction optical system as shown in FIG. 6 is used instead of the amplitude frequency signals 16a and 16b in the vertical direction.
A signal that is driven by one cycle at 41a and then driven by the waveform 41b in the horizontal direction may be used. According to this, an object having a strong light amount, for example, an object such as a candle or a light, is strongly exposed in a cross shape even after the aperture is stopped down, so that an image having a so-called cross filter effect can be obtained.

In addition, in the present invention, a signal waveform for providing a filter effect includes a waveform that increases the amplitude in a time series, and a waveform in which the phase of the waveform in FIG. 6 is shifted by 180 degrees from each other in order to change the direction of the cross filter. The present invention can be applied to any waveform.

(Effects of the Invention) According to the present invention, a part of the correction optical system of the photographing system is driven eccentrically at a predetermined amplitude frequency during exposure of the photosensitive surface based on an input signal from the outside, thereby obtaining a photographing system. Thus, it is possible to achieve a variable filter effect photographing apparatus that can easily and quickly apply various filter effects to an image obtained by the method.

Also, if the present invention is applied to a photographing system having an anti-vibration means, a variable filter effect photographing apparatus having various filter effects can be easily obtained by simply providing an analog switch and an input means serving as a transmission source. can do.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a main part of a first embodiment when the present invention is applied to a photographing system having an image stabilizing unit, and FIG. 2 is a block diagram showing a signal input form of the first embodiment of the present invention. And FIG. 3 shows the second
It is a block diagram of the filter block of a figure. FIGS. 4 and 5 are block diagrams showing signal input forms of the second and third embodiments of the present invention, and FIG. 6 is an explanatory diagram of another embodiment of the signal waveform used in the present invention. In the figure, 52 is a camera body, 58 is a correction optical system, 53a1, 53b1 are angular accelerometers, 58a, 58b are drive units, 11a, 11b, 41a, 41b are amplitude frequency signals, 57a, 57b are analog integration circuits, 59 Is a photosensitive surface.

Continued on the front page (72) Inventor Masao Kakai 770 Shimo-noge, Takatsu-ku, Kawasaki-shi, Kanagawa Prefecture Inside the Tamagawa Office of Canon Inc.

Claims (6)

(57) [Claims] An eccentric drive of a part of a correction optical system of a photographing system during exposure of a photosensitive surface based on an amplitude frequency signal input from the outside by a driving means, so that a desired image is formed on the image formed by the photographing system. A variable filter effect photographing apparatus, characterized in that the filter effect is provided. 2. The photographing apparatus according to claim 1, wherein said correction optical system is driven eccentrically simultaneously with exposure of said photosensitive surface. 3. The photographing apparatus according to claim 1, wherein said correction optical system is driven eccentrically after a predetermined delay time from exposure of said photosensitive surface. 4. The filter effect according to claim 3, wherein said correction optical system is driven eccentrically after a predetermined delay time from exposure of said photosensitive surface, and simultaneously the aperture diameter in said photographing system is changed. A variable shooting device. 5. The apparatus according to claim 3, wherein said delay time is made variable according to the exposure time of said photosensitive surface.
A photographing device having a variable filter effect as described in the above. 6. A filter characterized in that when a part of the correction optical system of the photographing system is eccentrically driven based on a shake signal, the correction optical system is eccentrically driven by a predetermined alternating signal in addition to the shake signal. Variable effect shooting device.