PURPOSE:To prevent an incorrect focusing by providing a sensor consisting of plural light receiving elements arranged in a string shape, and performing a focus adjustment positioning the sensor at a point based on the maximum counting value out of the changing points of a sensor output found before the focus adjustment CONSTITUTION:A film 1 is exposed with light from a light source (a) passed through a lens (b), and furthermore, after it is passed through a lens (c), is introduced selectively to a screen (h) side or a reading side 3 with a light path switching mirror (d) Before an automatic focusing operation is performed, a system controller 17 moves an image sensor (f) little by little with a subscan motor (g), and fetches the binary changing point count value of each line with a binary value changing point counter 20, and finds a value Th in which the maximum value of the count value is multiplied by a prescribed factor, for example, 70% Next, the sensor (f) is restored to its start point, and is moved again, and the movement of the sensor (f) is terminated at a point where the count value exceeds over the value Th At the point, the automatic focusing operation is performed with a picture signal on the line Thus, the incorrect focusing can be prevented

Automatic focusing device

PURPOSE:To avoid a malfunction of an automatic focus controller by dividing the video signals passed through plural BPFs of different bands into a speed control system and a direction indication system with addition of a filter peak detecting circuit and an adder circuit to both systems respectively and also driving a lens focus control system with the outputs of both circuits. CONSTITUTION:A filter detection NAM circuit 21 detects the peak of each filter, and the effects of the depth can be avoided by transmitting the outputs of amplifiers 15-17 through the circuit 21. Here a motor driving circuit 8 is controlled by a speed control circuit 22 so that the driving speed of a motor 5 is set at a low level toward a focal point D0 compared with a case where an out-of-focus degree is large to the point D0. Thus the focusing control of a lens 1 is carried out smoothly. The output of an adder circuit 18 undergoes the synchronizing wave detection through a synchronizing wave detection circuit 19 and is turned into a switch input to the focus direction. Then the circuit 8 is controlled by a switch circuit 20, and the focusing direction is decided.

Automatic focus controller

PURPOSE:To improve the efficiency of coupling between an optical element and an optical waveguide and to facilitate fixation to a conductor by tapering the core and clad of the tip part of an optical fiber almost elliptically and forming the tip almost in an elliptic sphere shape CONSTITUTION:An arc 22 is generated between electrodes 8A and 8B, which are shifted finely as shown by arrows 15 and 16 to soften the optical fiber 7 over a wide range When rolling rollers 21A-21H begin to be driven, the optical fiber softened part is drawn in a taper shape as shown by arrows 13 and 14 The optical fiber which is softened and drawn by the rolling rollers 21A-21D nearby the electrodes are rolled and its section is worked gradually from a circle to an ellipse The center of the optical fiber which is made thin is melted with the arc The optical fibers 7A and 7B which are melted and rolled are moved as shown by arrows 24 and 25 by reversing the rolling rollers 21A-21H to face closely each other nearby the electrodes 8A and 8B AN arc is emitted again to form the two tip parts in an elliptic sphere shape Thus, the coupling efficiency is improved

Elliptic spherical optical fiber and its manufacture

PURPOSE:To perform the focusing of an image exactly without troubling a person by counting the changing point of a sensor output at each scanning, and performing the focus adjustment of an optical means based on the counted value. CONSTITUTION:An image sensor (f) outputs an analog sensor signal equivalent to the image on a microfilm 1, and amplifies it at an amplifier 14 and supplies it to a binarization circuit 15. A binary-coded picture signal is sent to a binary changing point counter 20, and the number of the changing points of a binary signal, that is, the number of edges is counted. By scanning the same line on the film, the counted value becomes the maximam value when an image-forming lens (c) is set at the optimum focus position. Therefore, by controlling a lens driving device 18 based on the counted value from the binary changing point counter 20 and terminating the driving device 18 at a time when the counted value becomes maximum, the most appropriate focusing state can be set automatically.

Automatic focus device

PURPOSE:To easily obtain natural stereoscopic feeling, by superposing two same videos shifting horizontally, observing them by the left eye and the right eye, respectively, and observing the video at a position separated by a distance corresponding to parallax by the left eye and the right eye, respectively. CONSTITUTION:Two pairs of cathode-ray tube devices for television or projecting devices for a projector are prepared, and a first video A and a second video B in which the first video A is shifted by a distance L (for example, several cm) corresponding to the parallax of both eyes horizontally are displayed on the same screen by using two pairs of display devices, and they are observed by the left eye and the right eye, respectively by using polarizing spectacles. Thus, a left eye image and a right eye image are superposed and displayed as video generated by separate display devices, and the deviation of an image corresponding to the parallax of both eyes is performed by an electrical means. In other words, it is realized by shifting the scanning position of a display tube by performing the insertion of a delay line, synchronous position deviation, and a DC offset, etc. In such a way, it is possible to observe a pseudo stereoscopic image with the natural stereoscopic feeling.

Display device for pseudo stereoscopic video

PURPOSE:To make the device compact by substituting the differential or differential circuit of the signal detecting circuit of one-dimensional solid-state image sensing elements with two sample holding circuits, a differential amplifier and an absolute value circuit. CONSTITUTION:One-dimensional solid-state image sensing elements 13 such as CCDs are disposed on the image plane of the image 2 by an image lens 1, and are driven by a driving circuit 5 in synchronization with the clock of a pixel clock generator 4, the time series electric signal whereof is inputted to sample holding circuits 6, 7. The sample holding circuits 6, 7 send the signal alternately to a differential amplifier by way of a frequency bisecting circuit 8 by the clock signal from the circuit 4. The differential signal thereof is sent to a microcomputer 13 via an absolute value circuit 10, a peak detector 11, and an AD converter 12. The control signal is sent to a step motor controller 14 in the direction where the peak value is maximum, and focusing is accomplished by way of a step motor 15 and a rack pinion mechanism 16. Thereby, the device is made compact.

PURPOSE:To obtain artificial stereoscopic images which do not fatigue eyes simply by mounting the device to an existing projector by forming a polarizing means to an attachment composed of plural narrow-angle prisms of nearly mutually equal distributions of the quantities of light of the two images projected onto a screen.

Oota Koukei

Papers

Automatic focusing device

Artificial stereoscopic projector