55results about How to "Short working distance" patented technology

To allow placement of optical members by providing a long back focus, make aberrations less subject to manufacturing errors, and reduce variations in aberrations during focusing. An endoscopic objective optical system includes, in order from an object side, a front group with negative refractive power, a focusing lens, and a rear group with positive refractive power, wherein: the endoscopic objective optical system satisfies conditional expressions (1) to (4) below:

4<FB/FL  (1)

FL/|Fc|<0.1  (2)

−3<F_—F/FL<−0.9  (3)

2.5<F_—R/FL<5  (4)

• • where FB is back focus of the entire system, FL is a focal length of the entire system, fc is a focal length of the focusing lens, |fc| is an absolute value of fc, F_F is a focal length of the front group, and F_R is a focal length of the rear group.

The invention relates to a head-mounted display device and an optical lens system thereof. The optical lens system comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are arranged in sequence from a light inlet side to a light outlet side along an optical axis, wherein each lens is a spherical lens with an refractive index, the first lens is a negative focal power lens, the second lens is a positive focal power lens, the third lens is a positive focal power lens, the fourth lens is a positive focal power lens, the fifth lens is a positive focal power lens, and the sixth lens is a negative focal power lens. The head-mounted display device provided by the invention comprises a machine shell and a display module which is installed in the machine shell, wherein the display module comprises at least one optical lens system disclosed in the invention and at least one display screen which is arranged on an optical axis, facing the light inlet side, of a second surface of the sixth lens. The head-mounted display device and the optical lens system thereof ensure angle of field of view, ensure good imaging quality, and have the advantages of short focal length and long working distance.

The present invention relates to a contents dispensing pump which is coupled to a container (V) for accommodating the contents therein and dispenses the contents, comprising; a pump main body (10); a pump upper body (20); a pump inner body (30); a dispensing valve (40); and an elastic member (50). The pump upper body (20) is coupled to the upper side of the pump main body (10) so that a pumping operation is made by an up and down movement with respect to the pump main body (10). The pump inner body (30) has a bowl shape with the middle thereof formed to be dented so that an inlet valve plate (70) is integrally formed on the lower surface. The dispensing valve (40) is coupled to the upward side of the pump upper body (20), and has, formed therein, a valve protrusion wheel (41) for opening and closing the content outlet (23). The elastic member (50) is positioned between the upper lateral surface extension piece (33) and the lower lateral surface extension piece (34) of the pump inner body (30) so as to draw the pump inner body (30) and simultaneously elastically support the pump main body (10) and the pump upper body (20).

An apparatus basically uses a simple and compact multi-axis magnetic lens to focus each of a plurality of charged particle beams on sample surface at the same time. In each sub-lens module of the multi-axis magnetic lens, two magnetic rings are respectively inserted into upper and lower holes with non-magnetic radial gap. Each gap size is small enough to keep a sufficient magnetic coupling and large enough to get a sufficient axial symmetry of magnetic scale potential distribution in the space near to its optical axis. This method eliminates the non-axisymmetric transverse field in each sub-lens and the round lens field difference among all sub-lenses at the same time; both exist inherently in a conventional multi-axis magnetic lens. In the apparatus, some additional magnetic shielding measures such as magnetic shielding tubes, plates and house are used to eliminate the non-axisymmetric transverse field on the charged particle path from each charged particle source to the entrance of each sub-lens and from the exit of each sub-lens to the sample surface.

The invention discloses a monocular vision detection method for a dislocation defect of a naked battery cell tab of a power battery. The monocular vision detection method comprises the steps a to g. The invention has the advantages that: 1, the monocular vision tab dislocation detection method is based on a perspective projection camera model, so that the photographing scheme is simple, a telecentric lens or a telephoto lens is not needed, the cost is low and the space is saved; for example, under the same visual field condition, the working distance of the lens needed by the monocular visiontab dislocation detection method is generally about 50% shorter than that of the telephoto lens needed by a method based on a weak perspective projection camera model, wherein compared with a telecentric lens required by a method based on an orthogonal projection camera model, the working distance is shortened by about 80%, and the cost is reduced by about 98%; 2, three-dimensional target distancemeasurement under the condition of a single camera is realized, and a calculation model is highly matched with the actual situation; and 3, the problem of three-dimensional measurement of the distance from the monocular tab to the side edge of the battery cell is greatly simplified, and the method is easy to understand and implement.

The invention discloses an ocular lens. The ocular lens comprises a reflective polaroid, a 1/4 wave plate and a lens set with positive focal power from a human eye side to an image source side in sequence along an optical axis, wherein the lens set comprises one or more lenses, and an aspherical mirror surface of any lens is plated with semi-permeable and semi-reflective optical thin film, and thedistance Lm between the reflective polaroid and the semi-permeable and semi-reflective optical thin film on the optical axis and the distance Ld between the reflective polaroid and an image source plane of the ocular lens on the optical axis satisfy the condition that Lm/Ld is larger than 0.25 and smaller than 0.75.

An optical storage disc has portions for storing pre-recorded or mastered information and portions for storing user writable information, where the mastered portion and the writable portions have different storage capacities or areal data densities. During manufacture, a substrate is formed with a sequence of bumps to represent the mastered information and a series of grooves and lands, where information can later be written on the lands. A phase-change material is deposited over the substrate, the phase-change material changing both physical structure and optical constants when written to, e.g., by a laser.

A lens tilt adjusting mechanism is configured by a piezoelectric element, a lens holder formed into a ring shape, and a holder fit-in part arranged in a tubular form in the movable part of an actuator. An objective lens is fixed on an inner side of the lens holder, the lens holder is fitted to the inner side of the holder fit-in part and held in the holder fit-in part in a tiltable manner when an outer peripheral surface contacts and slides along an inner peripheral surface of the holder fit-in part; the piezoelectric element is attached on the inner side of the holder fit-in part so that one end in an extending and contracting direction of the piezoelectric element contacts a step surface formed on the inner side of the holder fit-in part and the other end contacts the surface on the side away from an optical recording medium side of the lens holder; and other members are not interposed between the objective lens and the optical recording medium.

The invention discloses a method and a system for optimizing dispatching based on RFID, belonging to the technical field of RFID radio frequency identification. In the dispatching optimizing method, the product of the distance d between a forklift and cargos and the rated load-lifting capacity w of the forklift is used as the reference of estimating the work cost f of the forklift, the task dispatching problem of the forklift is abstracted into an appointing problem of m forklifts and n tasks and the optimal dispatching scheme is realized by calculating the lowest total work cost of all forklifts. According to the method and system for optimizing dispatching, the optimization to the traditional forklift dispatching problem is realized, the RFID technique can be positioned more real-timely and precisely, the measurement standard of the calculation method is more scientific, the forklift dispatching in a factory is more systemized, the work efficiency of the forklift is improved and the work cost of the forklift is reduced.

A highly reliable optical pickup which is not likely to collide with an optical disk is provided. Relative positions of two objective lenses 100 and 101 (along a focus direction) on a lens holder 102 are determined so that, while the objective lens 101 having a longer working distance is focused on an optical disk 200, the objective lens 100 having a shorter working distance and a protective member 103 are at positions which are more distant from the optical disk 200 than a height h of a protrusion which is present in an inner peripheral region of the optical disk optical disk 200.

The present invention discloses a micro-objective lens, comprising the first lens group, the second lens group, the third lens group, the fourth lens group, the fifth lens group, the sixth lens group, the seventh lens group, the eighth lens group, the ninth lens group and the tenth lens group with optical axis arranged in a sequence from the left to the right; the focal length of the first lens group is negative; the second lens group belongs to doublet, in which the focal length of the first and second lens is positive and negative respectively; the focal length of the third lens group is positive; the fourth and fifth lens groups belongs to doublets, in which the focal length of the first and second lens in each group is negative and positive respectively; the focal length of the sixth lens group is positive; the focal length of the seventh and eighth lens groups is negative; the focal length of the ninth and tenth lens groups is positive. The present invention also discloses a high-resolution broadband imaging system with aforesaid micro-objective lens.

An optical system of an optical pick-up, which is provided with a light source that emits a light beam, and an objective lens that converges the light beam emitted by the light source onto a data recording layer of an optical disc. The optical system satisfies a condition: 0.75<d·(M−1)/(M·L)<1.0, where d (mm) represents a thickness of the objective lens, M represents magnification of the optical system, and L (mm) represents an O/I distance which is defined as a distance between an object and an image. A beam spot suitable for the optical disc is formed by the objective lens on the data recording layer of the objective lens without using a coupling lens.