<label id="aihr5"></label>
    <thead id="aihr5"></thead>

      <thead id="aihr5"><optgroup id="aihr5"></optgroup></thead>
    1. <label id="aihr5"><meter id="aihr5"></meter></label>

        撥號18861759551

        你的位置:首頁 > 技術文章 > 使用C型可調對焦鏡頭

        技術文章

        使用C型可調對焦鏡頭

        技術文章

        Using C-Mount Focus Tunable Lenses

        Introduction

        Optotune Electrically Focus-Tunable Lenses provide flexible, fast-focusing solutions for a wide variety of machine vision applications, including quality control, sorting, or bar code reading. Unlike traditional optical setups, in which mechanical adjustments must be made for objects at different working distances, Optotune’s Electrically Focus-Tunable Lenses take only milliseconds to refocus and are free of mechanical translation. In addition to focusing applications, these lenses can reduce the number of light sources and the overall power consumption of adaptive illumination applications by providing highly flexible lighting parameters.

        The C-mount version of the standard electrically focus-tunable lens (EL-10-30), the Optotune C-Mount Focus-Tunable Lens (EL-10-30-C), is compatible with standard industrial cameras. To allow for additional adjustments to the focal range, an offset lens can be integrated into the C-mount focus-tunable lens. When combined with a positive power offset lens, the tunable lens can achieve short focal lengths and be used directly with standard industrial cameras. With a negative power offset lens, the lens combination can be focused at infinity, allowing the EL-10-30-C to be placed in front of existing optical components as a close-up lens for fixed focal length lenses. Various configurations for different specifications are described in more detail in this application note.

         

        Offset Lens

        The EL-10-30-C’s protective glass can be replaced by a 12mm or 12.7mm diameter offset lens. This allows the focal range to be shifted to any desired value. For example, the VIS coated Optotune C-Mount Focus-Tunable Lens (#88-937) has a standard focal range of +200 to +80mm. By integrating an offset lens with a focal length of -150mm (#86-905), the focal range can be extended from about -600mm to infinity to +170mm (1/fres = 1/fEL-10-30 + 1/foffset). Note: The maximum allowable thickness of the offset lens is 4.7mm.

         

        Doublet Configuration: EL-10-30-C for Camera Lenses

        Table 1: Recommended Offset Lenses

        Distance (D)

        Focal Length of Offset Lens

        Offset Lens Stock No.

        Field of View*

        Resulting Focal Length Range

        12.5mm

        20mm

        #49-917

        22.3°

        16 – 18mm

        17.5mm

        30mm

        #45-484

        17.4°

        22 – 26mm

        25mm

        42mm

        #45-485

        13.1°

        28 – 35mm

        *Full horizontal field of view on ½" format

         

        Integrating a plano-convex offset lens creates a doublet system, and can be combined directly with standard industrial cameras. Focal lengths as short as 16mm can be achieved for sensor sizes up to ½". Figure 1 and Table 1 show the setup with recommended offset lenses depending on the distance (D) between the EL-10-30-C and the camera sensor. By changing the current applied to the tunable lens, refocusing for different working distances from 100mm to infinity can be achieved. Figure 2 shows a series of images taken at different working distances using an EL-10-30-C and a 30mm focal length plano-convex offset lens, an f/# of 5, and a C-mount camera with a ½" sensor size.

         

        Figure 2: EL-10-30-C with Integrated 30mm FL PCX Lens

         

        Close-Up Configuration: EL-10-30-C in Combination with Fixed Focal Length Lens

        With an integrated plano-concave offset lens, the EL-10-30-C can also be used as a close-up lens for fixed focal length lenses. This combination creates a high optical quality, electronically controllable focusing unit. The fixed focal length lens alone would need to be refocused to accommodate different working distances. In the combined setup, all of the elements stay at a fixed position; only the curvature of the tunable lens is varied to achieve focusing for different working distances.

        Figure 3: Diagram of Combined Setup

         

        Figure 4: Combined Setup with Stock Numbers

         

        An example of a combined setup can be seen in Figures 3 and 4. A -150mm focal length plano-concave offset lens (#86-905) is used with the plano side facing the tunable lens.

        Figure 5: Optical Quality Comparison of Traditional and Combined Setups

         

        The images in Figure 5 demonstrate that a combined setup can achieve the same level of quality as using only a fixed focal length lens. This configuration has a field of view of 14.5° (for ½" sensor sizes) and operates at f/4.

         

        To prevent vignetting, it is recommended to use a fixed focal length lens with a short distance between the s position and the front of the lens. Vignetting is also a concern when using standard wide field lenses with short focal lengths and a field of view greater than 20° (for ½" sensor sizes). Recommended fixed focal length lenses with different field of views ranging from 6.2° to 14.5° (for ½" sensor sizes) are listed in Table 2.

         

        Table 2: Recommended Fixed Focal Length Lenses for Multiple FOV, FL, and f/#

        Field of View*

        Stock Number

        Focal Length

        Working Distance

        Aperture (f/#)

        Maximum Sensor Size

        14.5°

        #85-357
        #85-358
        #85-359
        #85-360

        25mm

        20mm – ∞

        Fixed: 2.8
        Fixed: 4
        Fixed: 5.6
        Fixed: 8

        2/3"

        14.5°

        #59-871

        25mm

        20mm – ∞

        Variable: 2.8 – 17

        2/3"

        13.3°

        #58-207
        #69-266
        #83-955

        25mm

        60mm – 1200mm

        Fixed: 2.5
        Fixed: 4
        Fixed: 8

        1/2"

        10.4°

        #85-365
        #85-366
        #85-367

        35mm

        50mm – ∞

        Fixed: 4
        Fixed: 5.6
        Fixed: 8

        2/3"

        10.4°

        #59-872

        35mm

        50mm – ∞

        Variable: 4 – 22

        2/3"

        8.2°

        #54-689

        35mm

        90mm – ∞

        Variable: 4 – closed

        1/2"

        6.2°

        #59-873

        50mm

        100mm – ∞

        Variable: 5 – 22

        2/3"

        *Full horizontal field of view on standard ½" sensor

         

        Wavefront Quality Dependent on Orientation and Focal Length Range

        In principle, Optotune’s focus tunable lenses exhibit a spherical lens shape (the nominal parameters can be found in the ZEMAX package, which are located on the product page). Since the membranes used are elastic, the lens shape is influenced by gravity. With the lens oriented with the optical axis vertical, the RMS wavefront error of the EL-10-30-C series is in the order of 0.1λ (measured at 525nm). With the lens configured with a horizontal optical axis, a Y-coma term must be added; therefore, for the highest quality imaging, it is recommended to use the EL-10-30-C with the optical axis positioned vertically.

        Figure 6: Wavefront Measurement of Electrically Focus-Tunable Lenses (at 532nm and 80% Clear Aperture)

         

        Furthermore, as can be seen Figure 6, the lens exhibits a smaller wavefront error when it is less curved corresponding to longer focal lengths. It is recommended to set the position of the fixed focal length lens such that the tunable lens can be operated in the long focal range corresponding to low current values.

         

        Response Time

        The rise time on a current step is about 2.5ms. However, it takes about 15ms until the lens has fully settled.

         

        Controlling Electrically Focus-Tunable Lenses

        The EL-10-30-C’s focal length is controlled by changing the input current (0 – 300mA). For simple focusing applications, a calibration using a look-up table is sufficient to achieve good repeatability. If the heating of the lens is significant, then sensing the temperature is recommended to calculate more precise look-up values. Each lens has a temperature sensor and 256 bytes of memory built in.

        聯系我們

        地址:江蘇省江陰市人民東路1091號1017室 傳真:0510-68836817 Email:sales@rympo.com
        24小時在線客服,為您服務!

        版權所有 © 2025 江陰韻翔光電技術有限公司 備案號:蘇ICP備16003332號-1 技術支持:化工儀器網 管理登陸 GoogleSitemap

        在線咨詢
        QQ客服
        QQ:17041053
        電話咨詢
        0510-68836815
        關注微信
        主站蜘蛛池模板: 国产亚洲综合色就色| 狠狠色伊人亚洲综合网站色| 久久综合精品国产一区二区三区| 伊人伊成久久人综合网777| 欧美亚洲综合色| 狠狠色丁香久久婷婷综合五月| 欧美亚洲另类久久综合| 色欲久久久天天天综合网| 伊人久久大香线蕉综合影院首页| 久久综合给久久狠狠97色| 激情五月激情综合网| 五月天激情综合| 亚洲熟女乱综合一区二区| 亚洲va欧美va天堂v国产综合| 五月丁香综合缴情六月小说| 久久香综合精品久久伊人| 亚洲国产日韩成人综合天堂| 色婷婷综合久久久久中文 | 欧美一区二区三区久久综合| 色婷婷综合久久久中文字幕| 精品第一国产综合精品蜜芽| 欧美综合天天夜夜久久| 综合久久一区二区三区 | 2020久久精品亚洲热综合一本| 区三区激情福利综合中文字幕在线一区亚洲视频1 | 欧美精品综合视频一区二区| 亚洲欧美伊人久久综合一区二区| 狠狠色丁香久久综合五月| 伊人久久大香线焦综合四虎| 久久综合中文字幕| 成人综合久久精品色婷婷| 亚洲综合无码AV一区二区| 亚洲精品综合久久| 激情综合丁香五月| 亚洲精品综合一二三区在线| 国产成人亚洲综合色影视| 狠狠狠色丁香婷婷综合久久俺| 观看 国产综合久久久久鬼色 欧美 亚洲 一区二区 | 狠狠色综合网站久久久久久久高清 | 亚洲成a人v欧美综合天堂| 国产成人精品综合久久久久|