摘要:
A lens module (100) including a base (110), a lens (120), a front cover (130), a first shielding plate set (140), a second shielding plate set (150), and a gasket (160) is provided. The lens is disposed on the base. The front cover is rotatably disposed above the base and the lens, and the front cover has a first through hole (131). Each of the first shielding plate set and the second shielding plate set is pivoted on the base. The second shielding plate set and the first shielding plate set interfere with each other. The gasket is fixed in the first through hole and coupled to the second shielding plate set. The gasket has a second through hole (162). When the base and the front cover rotate relative to each other, the gasket rotates with the front cover and drives the first shielding plate set and the second shielding plate set to limitedly swing.
摘要:
Field diaphragms for use in surgical microscopes are provided. The field diaphragms are positioned along an optical axis of a microscope illumination system. The field diaphragms include a frame portion configured to be received by the surgical microscope; and a non-circularly symmetric mask portion integrated with the frame portion. The mask portion is aligned such that marginal rays from an edge of the field diaphragm along a meridian of minimum diameter that reflect from a surface of an objective lens of the microscope reflect outside of an acceptance angle for relay through any ocular channel of the microscope.
摘要:
An optical-lens-set includes a first lens element of positive refractive power, a second lens element of an image surface with a concave portion near the optical-axis, no air gap between a third lens element and a fourth lens element, at least one of an object surface and an image surface of a fifth lens element being aspherical, both an object surface and an image surface of a sixth lens element being aspherical so that the total thickness ALT of all six lens element, the distance TL from an object surface of the first lens element to the image surface of the sixth lens element and total five air gaps AAG satisfy ALT/AAG≤4.5 or TL/AAG≤5.5.
摘要:
There is provided an objective optical system which is fast, and for which a change in the angle of view at the time of focusing is small, and which has an adequate depth of field at each object-point distance, and a superior performance corresponding to an image pickup element with a large number of pixels. The objective optical system includes in order from an object side, a first unit G1 having a positive refractive power, a second unit G2 having a negative refractive power, and a third unit G3 having a positive refractive power, and focusing is carried out by moving the second unit G2, and the first unit G1 includes in order from the object side, a negative lens L1, one of a positive lens L2 and a cemented lens, and a positive lens L3, and the third unit G3 includes a positive lens L7, and a cemented lens of a positive lens L5 and a negative lens L6.
摘要:
An electrochromic device is structured to include multiple independently controllable electrochromic regions which can be independently controlled to switch to different transmission levels. One of the electrochromic regions is isolated from any direct electrical connection with any electrodes, and one or more other electrochromic regions interpose an indirect electrical connection between one or more electrodes and the isolated electrochromic region. The electrochromic device can be structured to include multiple independently controllable electrochromic regions, based at least in part upon segmentation of the conductive layers into separate segments to establish the various electrochromic regions.
摘要:
The art has, disposed in order from an object, a first lens group (G1) having negative refractive power, a second lens group (G2) having positive refractive power, a third lens group (G3) having negative refractive power, and a fourth lens group (G4) having positive refractive power, in which zooming is made by varying air distances between the lens groups, respectively, the first lens group (G1) has, on a side closest to the object, a negative meniscus lens (L11) having a convex surface facing the object, at least a part of the first to fourth lens groups (G1 to G4) is provided to be movable, as a vibration-proof lens group for correcting an image blur, so as to have a component in a direction perpendicular to an optical axis, the fourth lens group (G4) has at least four lenses, and the following conditional expression (1) is satisfied: 0.20
摘要:
An iris diaphragm comprises a stationary ring, a rotatable adjusting ring, and a plurality of shutter blades. The plurality of shutter blades forms a diaphragm aperture inside the stationary ring and rotation of the adjusting ring moves the shutter blades inside the stationary ring whereby the size of the diaphragm aperture can be changed. The shutter blades are formed as a flat opaque surface and at least one of the shutter blades comprises at least one transparent region formed in said opaque surface. A light fixture comprises such iris diaphragm arranged between a light source generating a light beam and an optical assembly configured to project the light beam along an optical axis.
摘要:
The art is formed of, disposed in order from an object, a first lens group (G1) having positive refractive power, a second lens group (G2) having negative refractive power, and a third lens group (G3) having positive refractive power, in which at least a part of the second lens group (G2) or at least a part of the third lens group (G3) is configured to be movable, as a vibration-proof lens group for correcting an image blur, so as to have a component in a direction perpendicular to an optical axis, and the following conditional expression is satisfied: 4.40