GB 17352-2010Performance and installation requirements of rear views mirrors for motorcycles and mopeds (English PDF)

4.2 Dimensions

4.2.1 Restrictions on the minimum dimensions for the reflecting surface

4.2.1.1 The area shall be no less than 6,900 mm2.

4.2.1.2 When the mirror is circular, its diameter shall not be less than 94 mm.

4.2.1.3 When the mirror is not circular, the periphery of its reflecting surface shall be able to accommodate a circle with a diameter of 78 mm.

4.2.2 Restrictions on the maximum dimensions for the reflecting surface

4.2.2.1 When the mirror is circular, its diameter shall not be greater than 150 mm.

4.2.2.2 When the mirror is not circular, its reflecting surface shall not exceed a rectangle of 120 mm x 200 mm.

4.3 Reflecting Surface and Reflectivity

4.3.1 The reflecting surface of the rear-view mirror shall be a spherical convex mirror.

4.3.2 The difference in the radius of curvature shall satisfy the following requirements:

a) The difference between the principal radius of curvature ri or ri and rp shall not be greater than 0.15r;

b) The difference between the rp (rp1, rp2 and rp3) value and the r value at any point shall not be greater than 0.15r.

4.3.3 The “r” value shall be no less than 1,000 mm and no more than 1,500 mm.

4.3.4 The normal reflectivity value determined in accordance with the method specified in

Appendix C shall not be lower than 40%. When the rear-view mirror has two working positions (day and night), the color signals of road traffic shall be correctly recognized in the day position, and the reflectivity value in the night position shall not be lower than 4%.

4.3.5 During normal use, even if exposed for a long time under adverse weather conditions, the reflecting surface of the rear-view mirror shall still satisfy the reflectivity value specified in

4.3.4.

4.4 Impact and Bending Resistance

4.4.1 The rear-view mirror shall be subject to impact test and bending test in accordance with the methods specified in Appendix B, so as to determine its capability to withstand impact and bending.

4.4.2 During the impact test, the pendulum shall be able to continue swinging for more than

20° in the plane of its release trajectory after impacting the rear-view mirror.

4.4.3 After the impact test and bending test, the reflecting surface of the rear-view mirror shall not be broken, but it will be deemed to comply with the requirements if it falls into one of the following two situations:

a) The glass fragments remain stuck to the protective shell or to objects firmly connected to the protective shell. The glass can be partially separated from the above-mentioned parts, but the length of any side of the broken area shall not exceed 2.5 mm. At the point of impact, small fragments may break away from the above-mentioned parts.

b) The reflecting surface is made of safety glass.

5.1 General Requirements

Under normal use condition, the rear-view mirror shall be fixed in such a mode that it does not significantly change its field of view due to movement or cause the driver to have an illusion of the image due to vibration.

5.2 Quantity

Two rear-view mirrors shall be installed on the motorcycle, one on the left side and one on the right side of the motorcycle.

5.3 Position

When the direction handle is perpendicular to the longitudinal center plane of the motorcycle and the rear-view mirror is adjusted to the normal position, the distance between the center of the mirror and the longitudinal center plane of the motorcycle shall be no less than 280 mm.

5.4 Adjustment

The driver shall be able to adjust the rear-view mirror from his normal driving position.

B.1.1.2 The center of impact of the pendulum coincides with the center of the rigid sphere. The mass of the pendulum converted to the impact center shall be 6.8 kg ± 0.05 kg, and its calculation formula is:

Where, m0---the mass of the pendulum converted to the impact center, expressed in (kg);

m---the mass of the pendulum, expressed in (kg);

d---the distance between the center of the mass of the pendulum and the swinging axis of the pendulum, expressed in (mm);

I---the distance between the center of the rigid sphere and the swinging axis of the pendulum, expressed in (mm).

B.1.2 Test process

B.1.2.1 In accordance with the method recommended by the rear-view mirror manufacturer or

motorcycle manufacturer (when appropriate), fix the rear-view mirror on the test bench.

B.1.2.2 During the test, the positioning of the rear-view mirror

B.1.2.2.1 The direction of the horizontal and vertical axes of the rear-view mirror shall be the same as the actual vehicle loading state.

B.1.2.2.2 If the rear-view mirror is adjustable in an angle relative to its base, then, it shall be located within the adjustment range specified by the rear-view mirror manufacturer or motorcycle manufacturer, and at the most unfavorable position for swinging during impact.

B.1.2.2.3 If the distance of the rear-view mirror relative to its base is adjustable, then, the adjustment device shall be adjusted to the position where the protective shell is closest to its base.

B.1.2.2.4 If the reflecting surface can be adjusted within the protective shell, then, the upper corner farthest from the motorcycle shall be adjusted to the position where it protrudes the most from the protective shell.

B.1.2.3 The plane where the pendulum release trajectory is located shall be parallel to the longitudinal center plane of the motorcycle. When the pendulum is in the plumb position, the horizontal plane and the longitudinal vertical plane passing through the center of the rigid sphere shall pass through the center of the mirror defined in 3.5, and the rigid sphere shall lightly touch the surface of the rear-view mirror.

B.1.2.4 When the pendulum is in the plumb position, the contact point of the rigid sphere is not

Appendix C (normative)

Method of Reflectivity Determination

C.1 Terms and Definitions

C.1.1 CIE standard illuminant A1):

C.1.2 CIE standard light source A1): gas-filled tungsten lamp at correlated color temperature

T68 = 2,855.6 K.

C.1.3 CIE 1931 standard chromaticity observer1): it is a radiation sensor, whose chromaticity characteristics are equivalent to the trichromatic excitation value 𝑥(lambda), 𝑦(lambda), 𝑧(lambda) (see Table

C.1).

C.1.4 CIE spectral trichromatic excitation value1): in the CIE (x, y, z) system, the trichromatic excitation value of equal energy spectral components.

C.1.5 Photopic vision1): normal eyes are adapted to vision at a brightness of at least a few candelas per square meter.

C.2 Instruments

C.2.1 Overview

C.2.1.1 The test instrument consists of a light source, a test mirror support, a receiving unit with light detector and indicating instrument, and a device to eliminate the influence of external light (see Figure C.1).

C.2.1.2 The receiving unit may include an optical integrating sphere for measuring non-planar mirrors (convex mirrors) (see Figure C.2).

C.2.2 Spectral characteristics of light source and light detector

C.2.2.1 The light source consists of CIE standard light source A and a lens that can turn the light emitted by the light source into a parallel beam. In order to keep the light source voltage stable when the instrument is working, it is recommended to use a regulated power supply.

1) Definition taken from CIE (International Commission on Illumination) Publication 50 (45), International

Electronic Glossary, Group 45: illumination.

C.2.2.2 The spectral response of the light detector attached to the receiving unit shall be proportional to the photopic brightness function of the CIE (1931) standard chromaticity observer (see Table C.1). It is also possible to use other illuminant-filter-receiver combinations that generate effects that are completely equivalent to CIE standard illuminant A and photopic vision. When using a light-integrating sphere in the receiving unit, the inner surface of the sphere shall be coated with a matte (diffuse), spectrally non-selective white paint.

C.2.3 Geometric conditions

C.2.3.1 The incident beam angle (thetai) is preferably 0.44 rad ± 0.09 rad (25° ± 5°) with the vertical line perpendicular to the test surface and shall not exceed the upper limit of the angle (0.53 rad or 30°). The angle between the receiver axis and this vertical line (thetar) shall be equal to the incident beam angle (see Figure C.1). The diameter of the incident beam on the test surface shall be no less than 19 mm, and the area covered by the reflected beam on the light detector shall be as close as possible to the coverage area when the instrument is calibrated, and smaller than its photosensitive area, but not smaller than 50% of it.

C.2.3.2 The diameter of the light-integrating sphere used for the receiving unit shall be no less than 127 mm. The apertures of the light-integrating sphere incident window and the test mirror window shall be able to allow all incident beams and reflected beams to pass through. The light detector shall be placed away from direct exposure to incident and reflected beams.

C.2.4 Light detector -- the electrical characteristics of the indicating instrument

On the indicating instrument, the reading output by the light detector is a linear function of the brightness in the photosensitive area. In order to facilitate zero-setting and calibration, light, electricity, or the combination of light-electricity may be adopted, but the method adopted must not affect the linearity and spectral characteristics of the instrument. The accuracy of the receiver-indicating system shall be within ± 2% range of the full scale or ± 10% range of the reading (limited to the smaller of the two).

C.2.5 Test mirror support

The test mirror support shall facilitate the positioning of the test mirror, so that the axes of the light source support arm and the receiver intersect on the reflecting surface. The reflecting surface may be located in the middle of the lens, or on any side, depending on whether it is the first surface, the second surface, or a “conversion” prism.

C.3 Methods

C.3.1 Direct calibration method

C.3.1.1 The direct calibration method uses the atmosphere as the reference standard. This

method is applicable to instruments whose structure allows the receiver to be adjusted to the optical path of the light source for 100% measurement calibration (see Figure C.1).

C.3.1.2 Under certain circumstances (for example, when determining the low-reflectivity

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