摘要:
An image forming optical system comprising: a first positive lens unit disposed closest to the object side in the image forming optical system; an aperture stop; and a second positive lens unit disposed closest to an image side in the image forming optical system, the second lens unit comprising: a front lens unit whose surface closest to the image side is a concave surface which faces the image side; and a rear lens unit consisting of one positive meniscus lens whose convex surface faces the image side, the image forming optical system satisfying the following conditions: −1.0
摘要:
Disclosed are heat sinks particularly effective in cooling semiconductors of a high heat dissipating density and including a multiplicity of tabular fins laminated via spacers and having through-holes pierced in their central parts, the holes admitting introduction of cooling fluids which radially flow in between the fins. The cooling fluids are supplied to the respective heat sinks attached to the multiplicity of semiconductors mounted on a board. In a specific form of the invention, the semiconductor cooling device has a heat sink provided with parallel tabular internal fins and a cooling fluid nozzle having an elongated opening substantially orthogonal to the fins, the nozzle being disposed to span over the parallel tabular fins substantially at longitudinal mid portions of these fins, so that the cooling fluid is evenly distributed from the mid portions of the fins to both longitudinal ends of the fins.
摘要:
A cooling system for cooling an electronic device by allowing a cooling fluid to flow in contact with heat generating components such as LSI chips of the electronic device arranged in series along the major flow of the cooling fluid. The cooling system has heat radiation fins attached to the heat-generating components, and a cooling duct defining a cooling fluid flow passage in which assemblies composed of the heat-generating components and the heat radiation fins are disposed. The flow passage has, at the upstream end of the upstream end assembly, a cross-sectional area greater than that of the assembly when taken in a plane perpendicular to the direction of the major flow of the cooling fluid. The cross-sectional area of the flow passage progressively decreases towards the downstream end, whereby the flow passage is divided into a main passage through which a main flow component of the cooling fluid directly flows into the series of assemblies and an auxiliary passage through which an auxiliary component of the cooling fluid flows substantially vertically towards the heat-generating component to impinge upon the heat generating component.
摘要:
An object of the present invention is to actively control at least one of the position and direction of the imaging field in a subject and to observe a desired observed region in the subject certainly in a short period of time. A body-insertable device system according to the present invention includes a capsule endoscope 1 introduced into a subject and a permanent magnet 3. An imaging unit of the capsule endoscope 1 for taking an image inside the subject is fixed in a casing. The capsule endoscope 1 includes a drive unit for changing at least one of the position and posture of the casing in the liquid 2a which is also introduced in the subject 100. The permanent magnet 3 controls the operation of the drive unit for changing at least one of the position and posture of the casing in the liquid 2a.
摘要:
An image display apparatus includes a display unit that displays images contained in a plurality of image groups inside a subject picked up by a plurality of imaging devices, and a control unit that extracts a related image related to a currently displayed image currently displayed in the display unit from the plurality of image groups to make the display unit display the related image extracted.
摘要:
An image display system has a capsule endoscope for capturing an in-vivo image of a subject, a receiving device for receiving the in-vivo image from the capsule endoscope, and an image display apparatus for displaying a group of in-vivo images of the subject. The capsule endoscope has an imaging unit having a black region which optical rays do not reach in an effective pixel region contributing to image capture. By the imaging unit, an in-vivo image including the signal level of the black region is detected. The receiving device receives an image signal of the in-vivo image. The image display apparatus obtains an in-vivo image group from the receiving device. The image display apparatus does not display an in-vivo image in the in-vivo image group determined as an image influenced by fluctuations in the power source voltage but displays a stable in-vivo image which is not influenced by fluctuations in the power source voltage.
摘要:
A picture signal encoding of a predictive encoding type. The encoding process is performed so that a summation between a quantized error of codes respectively representing at least two slots in one of N (N is an integer greater than 1) quantizing patterns, for current value data and a quantized error to be obtained when next value data is coded according to at least two quantizing patterns.