Laser Lenses Image Lenses Image Lenses GCO-23 Bi-Telecentic lenses (Match, Iris fixed) GCO-232 Bi-Telecentic lenses (Intigrate, Iris adjustment) GCO-26 Object-Telecentic Micro-vision Lenses

Laser Image Lenses Lenses Daheng Optics Telecentric Lenses For most lenses, an object closer to the lens produces a larger image. Consequently, the image of the object or parts of the object which does not lie in a plane parallel to the image plane will exhibit perspective distortions. In many measurement applications, however, perspective distortions are undesirable. It is required that an imaging system performs parallel projection that eliminates the perspective distortions and removes occlusions of objects occurred. Such imaging system is the telecentric lens. They are frequently used...

Image Lenses Image-Space Telecentric Lenses The aperture stop is on the front focal plane of objective lens, and the exit pupil located at infinity. A shift in the image plane does not affect image magnification. The chief ray of the emergent rays will be always parallel to the axis, and the intersection of it on the image plane will also not change. Image-space telecentric lenses are in demand for digital cameras Catalog Products & Supplies which make the light rays hit the sensor straight-on. The rays from a conventional lens are straight-on only in the center; at the edge, however, they hit...

Laser Image Lenses Lenses Daheng Optics Image Lenses Telecentricity No Perspective Error. Telecentricity describes the angular deviation of the chief ray from a ray parallel to the optical axis. A lower angular value means a lens will reproduce an image more accurately. Our telecentric target allows keystoning in an image to be visualized and accurately measured. The amount of keystoning is related to the telecentricity of the lens that is imaging the target. The target is placed at a 45°angle to the optical axis so that the bottom of the target is further away from the lens than the top...

Image Lenses Telecentric Depth Telecentric Depth or telecentric range is the total distance in the front of and behind an object that remains in focus and with constant magnification. Objects can be placed within the telecentric range for measurement without introducing perspective error. Generally, larger apertures (lower Catalog Products & Supplies F#) reduce field depth. Also, although smaller apertures (higher F#) increase field depth, they reduce resolution and require much brighter illumination. Telecentric depth Aperture stop Telecentric depth Chief ray Aj j —t Image Lens Telecentric depth...

Laser Image Lenses Lenses Daheng Optics Image Lenses Working Distance It specifies the distance from housing. A telecentric lens operates distance. the object to the front of the lens properly at only one working Example 1: Measurement of Mechanical Parts When standard optics are used to image 3D objects, closer objects appear relatively larger than those further away. As a consequence, when an object such as a cylindrical cavity is imaged, the top and bottom circular edges appear to be concentric and the inner walls are imaged, as well (left). However, by using telecentric optics, the...

Image Lenses Other applications: Plastic part measurement: to measure rubber seals, o-rings and plastic caps which definitely need non-contact optical measurement techniques as they are difficult to handle without changing their shape thus altering the inspected dimensions. Electronics component measurement, Glass and pharmaceutical part Laser Image Lenses Lenses All dimensions are in mm unless otherwise specified. www.cdhcorp.com

Laser Image Lenses Lenses Daheng Optics GCO-23 Bi-Telecentic lenses (Match, Iris fixed) The series of telecentric system is developed by using a pair of base lenses to achieve telecentricity required on object and image plane. The combined telecentric lens systems is afocal lens system with an aperture stop located at the common focus of the front and back lens, resulting in the chief ray being parallel to the optical axis in both object and image space. Both the entrance and exit pupil are at infinity. A constant perspective or viewing angle and a constant magnification can therefore be...

Image Lenses GCO-23 Telecentric Lenses (The combinations of the base lenses) Any two of the base lenses can be combined via an interface (GCO-230101~231206) to build a telecentric lens system, for specific magnifications. Every base lens can act as either the front lens or the back lens, according to the object size or image size. Laser Image Lenses Lenses Interfaces and CCD adapters The interface settings between the base lenses are listed in the table below. A stop is built in the interface and aligned to achieve the telecentric effect. The CCD adapters are provided along with the interfaces....

Laser Image Lenses Lenses Daheng Optics Product Part No. Interface Magnification Field of Sensor Mount Working Telecen- Distortion Dimension Part No. View Format Distance tricity 0xL Front Lens GCO-2301 (Object size 50) Example A 1/2 inch CCD camera is used to inspest a circular object of 45mm in diameter. One can choose a combination as follows. For the object of 45mm, the base lens GCO-2301 can be used, which offers 50mm object size. For 1/2 inch CCD camera, the base lens GCO-2305 can be chosen for 1/2 inch CCD camera to give an image size of 8mm (or 6.4x4.8mm). The combined...

GCO-232 Bi-Telecentic lenses(Intigrate, Iris adjustment) Laser Image Lenses Lenses Product Magnification Field of View Sensor Mount Working Telecen Distortion Aperture Filter Dimension Part No. Format Distance -tricity (f/#) Thread 0xL All dimensions are in mm unless otherwise specified.

Laser Image Lenses Lenses Daheng Optics GCO-232 Lens Holder GCO-232 Lens Holder Part NO Application 00162 China Daheng Group. Inc. www.cdhcorp.com All dimensions are in mm unless otherwise specified.