Mitsubishi Denki Kabushiki Kaisha

Shinobu Ueda

Susumu Nakagakiuchi

Ken Onishi

Taketoshi Hibi

Kihei Ido

Keiji Hatanaka

Kenji Maeno

Takashi Shiroshita

Miyoichi Watanabe

Akiyoshi Hirano

An exposure control apparatus has a lens, a photoelectric conversion device, and a spatial light modulator. The spatial light modulator varies the amount of light received from the lens and reflected to the photoelectric conversion device. A control unit controls the spatial light modulator, and thus the exposure of the image focused on the lens, based on output from the photoelectric conversion device.

Exposure control apparatus including a spatial light modulator

In program retrieval using a magnetic tape in which programs are classified by index signals recorded on the tape, an image at the beginning of each program is displayed in a list on a multi-screen, and a desired program is directly selected using a count value of index signals. In recording, an index signal is recorded at a starting point of recording. When preparing a multi-screen at the time of reproducing, an image reproduced a predetermined time after detection of an index signal is reduced and stored in a memory.

Recording and reproducing apparatus

A visual display system in which light from a light source is modulated by a spatial light modulator having a plurality of controllable elements arranged in a first dimension. The modulated light is scanned by an optical scanning device along a second dimension to display an image. An exposure control apparatus has a lens, a photoelectric conversion device, and a spatial light modulator. The spatial light modulator varies the amount of light received from the lens and supplied to the photoelectric conversion device, thereby controlling the exposure of the image focused by the lens.

Visual display system and exposure control apparatus

A contrast detecting apparatus includes first extracting means for extracting a signal component of a first frequency band from a luminance signal obtained by imaging a subject, second extracting means for extracting a signal component of a second frequency band lower than the first frequency band from the luminance signal obtained by imaging the subject, and determining means for determining a state of contrast of the subject in accordance with extracted outputs of the first and second extracting means. Therefore, when the contrast detecting apparatus is used, it can be exactly and automatically determined whether the contrast of the subject exists or not in accordance with a luminance signal obtained from the subject. In addition, when the contrast detecting apparatus is applied to the automatic focusing apparatus, it is possible to control the drive of lens or information supplying means to users in accordance with whether the contrast of the subject exists or not, and as a result when the subject having no contrast is imaged, the lens is stopped to be driven so that function and operability of the automatic focusing apparatus can be improved.

Contrast detecting apparatus for controlling an automatic focusing

In an amplifier circuit, there are provided a preamplifier, a first differential-input amplifier and a second differential-input amplifier. An AC negative feedback path is formed between the output terminal of the preamplifier and the inverting input terminal thereof. The inverting input terminal is connected to a ground via a RC series circuit. An input signal containing a DC voltage component is supplied via the junction of the RC series circuit to the inverting input terminal. A voltage appearing at this junction is applied to both the first and second differential-input amplifiers as a reference voltage.

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Nagaokakyo, Japan

Shinobu Ueda