Imaging lens for mobile reading devices
An imaging lens and lens barrel technology, which is applied in the field of imaging lens, can solve the problems that affect the reading rate of the coded graphic symbols and the deterioration of the imaging quality of the coded graphic symbols, etc., so as to achieve the effect of improving the imaging quality
Inactive Publication Date: 2011-04-13
IDIWAY
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Problems solved by technology
When imaging the coded graphic symbols, the distance between the reading device and the coded graphic symbols (the plane of alignment) is relatively close, and the lens is usually adjusted for clear imaging at the plane of the plane of alignment about 25 cm away from the lens. When the deviation is 25cm, the imaging quality of the imaging lens for the coded graphic symbols becomes poor, which affects the reading rate of the reading device for the coded graphic symbols
Method used
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[0018] In order to describe the technical content, structural features, goals and effects of the present invention in detail, the following will be described in detail in conjunction with the embodiments and accompanying drawings.
[0019] see figure 1 , which discloses a specific embodiment of the imaging lens of the present invention. In this embodiment, the imaging lens 10 has a hollow cylindrical lens barrel 100, and five all-glass lenses are fixed in the lens barrel 100. From the object side, the five all-glass lenses are arranged in a positive, positive, negative, positive, positive, positive, positive, positive, positive, positive, positive, positive, positive, positive, positive, positive, positive, positive, positive, positive, positive, positive, positive, positive, positive, positive, positive, positive, positive, positive, positive, positive, positive, positive, positive, positive, positive, positive, positive, positive, positive, positive, positive, positive, posit...
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Abstract
The invention discloses an imaging lens which is applied to mobile reading devices, such as mobile phones, PDA (personal digital assistant) and the like. The imaging lens is provided with a hollow cylindrical lens barrel, and five eyeglasses are fixed in the lens barrel. From an object side, the five eyeglasses are a first positive lens, a second positive lens, a third negative lens, a fourth positive lens and a fifth positive lens in sequence. The first positive lens is a concave-convex positive lens, the second positive lens is a convex-flat positive lens, the third negative lens is a double-concave negative lens, the fourth positive lens is a double-convex positive lens, and the fifth positive lens is a convex-concave positive lens. As the five eyeglasses of the imaging lens are in a design of positive, positive, negative, positive and positive arrangement and a design of each lens shape, the imaging quality of the imaging lens is increased.
Description
Technical field [0001] The invention relates to an imaging lens, in particular to a lens for imaging coded graphic symbols such as one-dimensional barcodes and two-dimensional codes. The imaging lens can be used in mobile reading devices such as mobile phones and PDAs. Background technique [0002] With the development of automatic identification technology, one-dimensional barcodes or two-dimensional codes and other coded graphic symbols are used to represent information in industries such as retail, logistics, and animal traceability. [0003] When reading the information represented by the coded graphic symbol, the coded graphic symbol is usually imaged by a reading device with an imaging lens, and then the image of the coded graphic symbol is processed and decoded to obtain the information represented by the coded graphic symbol. Due to the short distance between the reading device and the coded graphic symbol (alignment plane) when imaging the encoded graphic symbol, th...
Claims
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IPC IPC(8): G02B13/00G02B5/00G02B1/11G06K9/00
Inventor 肖业卫丁晓云张斧
Owner IDIWAY